vSphere AppHA issue

Hi

I tried to test vSphere5.5 AppHA in my lab, but I cannot see vSphere AppHA plug-in within vcenter Server GUI after I deploy AppHA appliance. I used nested two ESXi 5.5 and one vCenter Server in my lab(I think it should be work). I use default admin account(vsphere.local\administrator) to deploy vSphere App HA and login in the GUI. Does anyone can help on this question?

Thanks

islander