Setting up guest WiFi passcodes on D-Link Controller?

Hi,

Hope the follow question is not too 'low level' for this section

We have 8 D-Link DWL-3600AP access points unified with a D-Link DWC-1000 Wireless Controller. We would like to be able to generate temporary passcodes for visitors but getting a step-by-step guide when the equipment is out of warranty is a struggle. Has anyone got any experience of the D-Link portal or any tips/suggestions?

Thanks