I don't understand the issue either.
If you already have initiators setup, and are logged in to the GUI, where can't you login to exactly?
Andre @ Dell EMC
If this is about ssh via putty (or similar), the user name is "service" not admin. Password will be usually force set during initial setup.
For vmware side of config, i dont think you need any login from vmware but Unity may need vSphere detail for discovery.