My password isn’t good enough

I have upgraded my Mac mini Server to Yosemite. Having been told my server software won’t work, I upgraded that as well. Now when I try to load the app, it says “Administrator access is required to set up OS X Server on this Mac”, and asks for my password but won't accept it. Is there any way I can resolve this? I am not a computer guru. I only bought the Mac a couple of months ago to teach myself about servers and keep the old old grey cells ticking over. Keith English It sounds as if your user account lacks administrator privileges. Open System Preferences -> Users & Groups. Your user name should say ‘Admin’ underneath. If it says ‘Standard’, log in from an Admin account and try again.