Minicom freezes on raspi pi zero

Always after the command sudo minicom -D /dev/ttyAMA0 -b 115200 the console freezes and i cant do something. I tried ttyS0 too but it wont work at all. I tried nearly every tutorial for uart etc. but nothing worked for me. All i want is to control a gsm modul to send/receive sms on my raspberry.

The user you have logged in as must be a member of the group dialout.

sorry for the question but what member?

The user that you are loged in as.