YaST's DSL stuff is (presumably) for a DSL modem connected to the wired port.
If you have a DSL router which is also a wireless access point then I would expect you
to talk to the router via a "web" interface.
(e.g. I configure my Belkin AP via
mozilla
http://192.168.0.42
where 192.168.0.42 is IP address DHCP assigned to the AP.
My old 3Com ISDN router was same sort of idea.
)
Perhaps if you explained how your network(s) are arranged I/we could guess better.