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At this point I do not believe we can configure DHCP on the L2 switch (at least not in the HiveManager GUI) - If I am wrong, someone will correct me.
If the Aerohive switch is in "router" mode, you will have to create networks for those three VLANs and enable DHCP. It would be a better practice to have a router or an external DHCP server hand out user IP addresses.
Or you could configure one of the APs as a DHCP server, but I would recommend against that except for maybe a Guest VLAN.
Best practice would be to use an external DHCP server.