ProCurve switches don't yet have the option of configuring interfaces as router ports. (Comware switches do.) Just turn op IP routing and enable IP addresses on different VLANs.
ProCurve switches can't act as a DHCP server. For DHCP relay though, you want some thing like this:
vlan 30
name "Wireless"
untagged A1,B7-B8
ip helper-address 172.20.100.69
ip address 172.20.30.1 255.255.255.0
exit
[PS: Since the ProCurve switches are effectively E Series, this post should really be in the E Series postings. Comware switches are effectively the A Series/H3C switches.]