Blocking system

Hello! I usually contribute in another project, such as Wikipedia. I don't really understand about technical stuffs in translatewiki. I tried to find someone to ask about, and I found you. So, I found an abuser's (AJBot2) contributing here, he's already global locked there. I want to make block request for him but i dunno how and where. His translations are mostly nonsense. Can you help me for this case? Thanks for your help.