ok..ok... i got. since u dsl 504t and u want other 2pc connect through wifi. u need to get a wireless network.... since u got the dsl-504t, i recommend u get wireless access point.... dw2000ap. it a dlink wireless switch. as it can access wlan.... u also can access internet....

with the that .... settle problem aledi..... but it cost another 330 buck...
and u don need the dsl 504..... but if buy dwl-200ap access point.... only cost u 230 buck only....and u still using the dsl 504.... think which the best for u.....

i using dsl-500t modem w/ router, and des-1005d 5port switch, and dwl-2000ap access point...... home network work smooth..... and access internet a - ok, about setup...... u better ask.... network person.....
coz i sent my networkin device to seller so he can setup n configure it...
my advise is get a technician to do for u..... :0