When you open up your profile, you can see your rank through time as a blue line: Play Go at online-go.com! | OGS
The shaded blue area is a confidence interval around your rank. As you can see, this is very broad now, because you haven’t played many games. This will narrow down and stabilise as you play more. Then you can see what your level is.

“Beginner ranks” go from 30 kyu (lowest) to 1 kyu (highest), and “master ranks” go from 1 dan (lowest) to 9dan (highest) . The “k” and “d” stand for “kyu” and “dan” 30k…1k; 1d…9d

Don’t worry about your rank, just have fun playing.
However, if you want to have a fair but challenging match, I would advise you to play games with people with a +/- 1 rank difference from you.

My strategy is to start a game, but restrict my match to players who are around my rank. It is more likely that we’ll both have a fair chance of winning, and a fun game. You can do this on “Custom Game -> create”: Play Go at online-go.com! | OGS

EDIT: There is also another number (in the thousands) on the left y axis of the graph in your profile. This is another scale measuring rank (called the glicko-2), but this one is more straightforward: the higher, the better. However, people in the Go community don’t tend to use it when discussing rank. So just ignore this for now.