Pick a descriptive name so you can find your track again easily in your list. For example: "Col du Galibier from Briançon" or "Tour de Chartreuse".

To estimate your times on the track, Cyclograde uses a speed profile. The speed profile says how fast you ride at each gradient, which is what makes the time estimates reliable.
1) If you're signed up, you can use your own speed profiles by picking the Custom profile option (you need to create at least one speed profile first).
2) If you don't have a custom speed profile, pick a reference speed on the flat instead: the average speed you ride at on a route with no climbing and no descending (25 km/h, say). Cyclograde uses that average speed to work out a speed profile automatically.
With a reference speed, the estimated times will match your real speeds less closely.

The model sets how precisely the gradient colours are split. You have 3 models to choose from, from the simplest to the most detailed:
1) The "Simple" model uses only 3 colours, to tell climb, flat and descent apart
2) The "Detailed" model uses 9 colours, for a finer read on the gradients
3) The "Full" model offers 25 colours, for a very precise view of every percent of gradient

Each style uses different colours for the gradients. The information is exactly the same, only the colours change.

The elevation profile generated for your track isn't just meant to be looked at on screen, it's meant to help you out on the ride.
There are several ways to use it:
1) Download the profile as an image or a PDF and keep it on your phone so you can check it as you go
2) Print the PDF and take it with you. Several print-friendly formats are available, pick the one that suits you best.
You can choose between "A4 sheet" to print on a standard sheet of paper, "smartphone" or "smartphone (portrait)" for an in-between format you can show on your phone or slot into a bike phone mount, or "sticker" for a compact format you can print on a sticker and stick on the top tube of your bike.
Have a look at the Using your track profile out on the ride section to help you pick the format that works for you.

By default, everything is shown on the elevation profile generated for the track. You can untick options if you want a simpler graph.
Here are the options available:
Places these are all the places found along the track: landmarks in towns, villages, ... If you untick this option, no place is shown on the profile, so you lose the recognisable landmarks along the way and the intermediate times with them (apart from the passes, which have their own option).
Passes these are the mountain passes found along the track.
Distance this is the distance shown for each place or pass found along the track.
Estimated time this is the estimated time shown for each place or pass found along the track.
Actual time this is the actual time shown for each place or pass found along the track. It only appears if the GPX file you upload holds time data. You can't show the estimated time and the actual time together.
Climbs these are all the climbs found along the track, with the distance and the average gradient shown for each one.
Statistics these are the main figures worked out for the track: distance, elevation gain, average speed.

The advanced options let you change the technical settings of the track analysis. Changing them without understanding what they do isn't a good idea.
These settings control gradient detection, the number of places shown and climb detection.

Click "Choose a GPX file" and select your GPX file. The name of the file you picked shows up in the box.

Click the Generate button to start building the elevation profile of your track. Generating takes anything from a few seconds to a minute or so.
You can keep browsing the site, you'll get a notification when your track is ready.
If you don't see any notification after a minute, you can always find your track on the tracks page.