Unattended Access Administrator Credentials

I am a brand new user.  I need to be able to use Unattended Access but cannot get it to function.  I can set it up on my client computer but when I try to log back in it asks for Administrator Credentials.  I have entered every username and password I have and nothing works.  I have set up a Master Administrator and that doesn't work.  If I can't get this figured out ASAP I am going to let the free trial run out and find another product.  This is way to frustrating,  In many ways it is unintuitive and the online help is less than beneficial.