yes, those are two different networks; youll need to add a PASS rule on your WLAN tab to be able to access the specific IP of your freeNAS box.
source: WLAN subnet (or narrow down to IP of computer your trying to access freenas from; if that PC uses dhcp to aquire its address set a static rule in the pf dhcp server for that device)
protocol: tcp udp
source port: ANY
dest port: 80 & 443 (set an alias to use multiple ports, dont fill in 80 and then 443 in rules page, that obviously will open a range which is not what you want)
--- turn logging ON on the pf box to trouble shoot; it may very well work after the above rule is applied; if not and you can see no logs showing an active block, the settings in freeNAS need to be tweaked