7 minutes ago, Lurick said:
ASDM is for ASA configuration, not router configuration
Aw crap really, I thought it did Router too.
Okay in that case:
enable <Enter enable password> conf t ip http server ip http authentication local ip access-list standard 20 permit 192.168.0.0 0.0.0.255 (for an 192.168.0.0/24 subnet) exit ip http access-class 20
If you can access the gui via http://routerIP you can use
copy run start
to make it permanent.