Where can i report vandalism?

Hello,

I’ve searched through google and this forum but didnt find where can i report a local user who is doing bad editions intentionally. Months ago i undid his editions and today i realized he changed them again.

Can you help me someway?

Cheers!

Your first step should be to contact the other mapper via changeset comments or mail. If that doesn’t work, see
https://wiki.openstreetmap.org/wiki/Data_working_group#Contacts_in_case_of_problems