I cant tell from the description of the problem if this is to be an AP or client ???
If AP then (leels like writing code…)
set a WEP code in the wireless interface tab (for that interface)
or in a security profile. remember to set the interface type = AP-Bridge.
Else
Set the WEP code in the security profile.
END
This may be over simplified but take a look in the wireless section of the online manual and it is all layed out there…
PS, WEP is just about useless… you may want to look at WPA2 if you can…