How do I add missing players?

I would like to add missing players to the team "1. FC Neubrandenburg 04" ID 8711731.

But NOT only in my private database on my computer via the editor but in your database files.

before someone writes again that you should use the editor. 

I would like to have them recorded in your database.
How and where can I do this?

People please not all at once... doesn't anyone know how this works?