How can I allow people to edit data in the app, once it is shared?
Because here is the thing, I want the people to edit by month the KPI of their teamworks
I think that depends… how you like that to be done? You can allow editing straight from the app (see docs) OR you could allow changing from the sheet side OR your users could use some other way to enter data, which then feeds into the app. (Like a simple Google Form shared for the team, for example). Does this help?
Does this existing topic address your question? Can users create and edit data, or are apps read-only?