I AM THE SITE ADMIN BUT WPMU DOESN'T ACCEPT ME ON MY SITE

i AM DISAPPOINTED! WHY DON'T I GET ACCESS TO MY WPMU DASHBORD?

Something doesn't work well. I installed MEMBERSHIP from a download from my account at WPMUdev. I got a message that I should get my API. So I loged in with my credential, copied the API number from my page, but then I didn't get acces to WHERE SHOUL I INSERT THE API KEY? We are 2 admins in the site (http://elo.org.br) and there seems to be a confusion.
PLEASE HELP ME TO GET QUICKLY TO WORK AGAIN!!! i understaand the wall you put infront of us to get to you, but there should be a possibility to get quick answers! Is this the right way? I hope to hear from you soon!
Best wishes
Marco