Admin for the matrix app?

Hello!
I installed the matrix chat 5 (synapce) but i cant figure out how i am supposed to moderate the chat whitout a admin user?

Ive googled around for quite a while and figured there is no admin in the chat it self, but you can use the server as admin panel or am im wrong?

I wanna know if there is a webgui for this or a shellscript. Thanks in advance.