When you login to Admin panel, go to Router --> Add New MikroTik, in field Username Login/Username Password, you need to write user/pass from Mikman (where can we find).i dont think you can access 192.168.x.x/dabsahv3/mikman
but you can access mikman through 192.168.x.x/dabsahv3/admin
Btw, you can access in Mikman directly, without Admin (in V2 works).