The bottom tab on the PintSwap navigation is the account tab, where you can edit your username, bio, and set a private key for automatic trading. Additionally, you can create a trade which will transfer you to the create tab, start or stop publishing your offers, and copy your address for sharing in the upper right hand corner.
You can also check out all of your current orders.
Lastly, you can always see your user profile in the bottom left hand corner of the app. Selecting this will take you to the account tab. In addition, you can start and stop publishing your orders using this button from every tab.