You want to add other admin ( owner/manager ) to your app?
Very easy !!!
Simply follow those short steps:
1 - Enter to your Facebook app and go to your business page
2 - Tap on ... ( up/right corner, next to search bar)
3 - Edit page,
4 - Settings,
5 - Page roles
And the rest is like on the Browser.
On the Browser
1 - Enter to your Facebook business page,
2- Click on settings ( up/right corner)
3 - Click on Page Roles
4 - add your partner as admin on the page:
After this, your partner will get an invitation to his phone through Facebook and he should accept it.
The last action is to send your partner the AppsVillage App admin link to install it on their mobile phones:
That's it ;)
If you have more issue send an email to firstname.lastname@example.org