how do I log into a virtual server

Once you've created the access policy, you'll want to edit it. If you click the "Edit" button to the right of the policy in the policy list, it'll bring up a new tab/page with the "Visual Policy Editor" (VPE). From there you'll add agents in the AAA flow, like a logon page.

APM, for all of it's power and flexibility, can also not the most intuitive thing in the world to configure. I would highly recommend perusing through the various APM documentation available.

http://support.f5.com/kb/en-us/products/big-ip_apm/versions.11-4-0.html

Start with the "Configuration Guide for BIG-IP Access Policy Manager" as that'll cover most of the product at a higher level, while the other documents will get into the weeds.