Need Help about cisco router

Pazu

it is really stupid and I dunno what the admin has done
the internet is from PCCW business and then the line was conected to a cisco router
it is shared to 2 pcs
but the strange thing is the DNS used in those PCs are from New T&T
and cos of the routing
the connecting speed is 1/10 as normal
how can increase the speed or go to see the config of that router?
its a 800 series router
need to connect to the console port to config?
any access I can make?