SOLVED Preference-change window will not accept my user name and password

[Cam D]

I'm using a Mac Pro 5,1 mid 2010, 2 x 2.66 GHz 6 core intel xeon with 64 GB 1333 MHz DDR3 using an SSD (brand new) as the start up disk and running OS High Sierra 10.13.6. I can log in on start-up with my user name and password no problem, I can even go into my settings and change the password if I want to. If I attempt to click the little lock icon to effect any other changes, the system will not accept my user name and password. Totally weird and extremely frustrating, I cannot get past this point no matter what I try. I use this computer primarily for video editing and have lots of work coming up very soon, I'm desperate, can anyone help me?

 

[Cory Cooper]

Hello and welcome.

Are you using the long or short name...i.e. Your Name or yourname?

C

 

[Cam D]

The problem was that I was not set up as admin, it seems crazy I know, long story but reinstallation of the OS and setting myself as admin worked.