What kind of Mic? Does it need 48V phantom?
Plugged into MIC input?
Mic Att to 0 ?
Mic Input selected?
It looks like 1-6 is low impedance and 7&8 are higher, have your tried changing the input?
Seems theres only a fader for some gain and the rest is a low level audio.
it looks like a fun mixer, the manual is >40 pages!