In the upper left corner, click on your user icon to open the drawer. At the top you will see your profile image - click on it to go to your profile page. In the middle you will see a button within your profile image to update it. Adding a well-recognizable profile picture helps your fellow students and your teacher recognize you, and it is also a nicer view. On the top right of the page, you can also add a personal banner.
In the upper left corner, click on your user icon and go to Account settings. Here you can change your name, add a personal website, change your account's privacy settings, and set your preferred language for the platform.
TIP: Make sure your name is spelled correctly, since it will help fellow students and teachers to find or @mention you.