HELP PLEASE

I have installed a plug in yesterday called IMSC Promote me PRO and when I did it asked to activate it so when I pressed to activate it it said I hadn’t enough permition to that page so logged off since this morning I have been trying to log on again and is all blank I press everything and the only thing that shows is the left hand side otiond, but if I press on it nothing comes up. I cant see my dashboard or even when I press on plug ins to deactivate it The plug ins wont show. PLease someone help me.