To start managing your servers, click your name at the top right and press the red label "Administration". This will take you to the administration panel.
Next press "Services" in the gray navigation which will list all the servers in your system.
If you do not see any servers listed, this is because you've probably did not synchronize any servers yet to your Ploi Core installation. You can do so by pressing "Synchronize servers" at the left.
You can also edit servers that are synchronized to your system by pressing the "Edit" button behind the server.