help with CLI cisco adsl router to add port foward

can anyone kindly tell me
CL instructions on how to
remove an access list and to add a
Nat rule to allow incoming port 5900
on a Cisco router?

all I want is to be able to use VNC

I would really like to learn IOS but don't have the time

many many thanks in advance


the router has an access list put there by the old maintainers
whom we don't use any more. They offered to take it out at
a huge cost, hence my desire to DIY.

btw it's a Cisco ADSL modem / router


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regards