If you've been invited to a Squad that just isn't for you and you're ready to leave you can part ways by doing the following.
In the top left corner of the app, tap on the 3 lines icon(hamburger menu).
A window will pop-out from the left hand side, click on your current profile name, in this case it would be 'Your Name Here*'.
You will be brought to the 'Edit Profile' page, at the bottom, you will see the option 'LEAVE THE SQUAD'. Click on that.
Confirm leaving the squad.