No dumb questions.
In the upper right hand corner you should see your “S” Icon. Click on that and a small window opens showing your recent activity. At the most upper right-hand corner of that you should see the little settings icon. Click that.
It will take you to your Account page. Along the left-hand side you should see ‘Profile’. In there you will find an ‘About me’ section as well as a place to add your location and website.
Under the account section you can add a picture if you’d like. You may want to change some email and notification settings while you’re in there too.