You can change things such as the plan you're on, tagging all receipts you submit with the app so users know where they came from, and get other important information in the Settings menu.

First, login and click on the username to the top right.

Note that if you have several accounts with Squirrel Street, changes will apply only to one account.  The name of the account will appear at the top.  Swipe right to close the menu.