Ok... your Sonicwall has 4 ports, but only 3 are active under Standard OS if I remember correctly. If you have version 4.x or better, that OS should understand VLAN tags (This used to be just for Exhanced, but I think they offered it on Standard with v4.X code). So if this is the case, you have two options.
You can create VLAN subinterfaces on the Sonicwall to match your VLANs you tag from your uplink switchport to the Sonicwall. See
(might give IE a security alert to download a file, but I promise it's good. It's a PDF document)
I remember your other posting about this situation and you might be able to use the Sonicwall to do your intervlan routing. Again, this might be a Standard vs Enhanced feature... so give it a try.
Then just choose a security zone for that VLAN subinterface (i.e. LAN, WLAN, DMZ, WAN) and do your access rules accordingly.
The second option would be to plug that Access Point directly into X3 on the Sonicwall and again, make that interface part of a security zone, access rules, etc...
If by chance the Access Point is too far to plug in directly, create yourself a dedicated VLAN just for it, pass that VLAN upstream through your switches till you get to the switch that has the sonicwall and from the untagged port in the wireless VLAN you created, uplink that to the X3 interface on the Sonicwall.
Hope that helps.