When you open the app this is the first section you will see.
Here you can find all the profiles you have created or you can create a new one.
To create a profile you need:
The profile section shows your osu! ID and your current osu! apikey. | Where can I find the apikey?
From here you can modify your apikey if you regenerate it from osu!
On OBS add a new browser source, name it and put these settings: