DON'T INSERT THE BATTERY UPSIDE DOWN!!! There is a printout on the white face of the battery stating that "this side is down". So you should see the blue face when inserting the battery.
Don't force under any circunstance!
There are three PDF quick setup guides available: Net Device, Line Device, and Cage.
Interesting other pages not listed in the menu are: Accessories, Pickleball, Clinic, Fixed Installation.
If you experience an issue with your In/Out device, first visit the troubleshooting page. Then fill the support form through the In/Out helpdesk.
If you don't own an In/Out and have a question, contact the In/Out team.