What is my username?

Go to Hard drive -> Users. Your username is the name of the folder with the house icon.

conradbraam wrote:

I'm getting prompted repeatedly by an app that wants to access my keychain.

The system wants an administrator username

so I type it in as "Conrad Braam"

But I'm doing that just because it's what I normally see when I login, I don't know if that is what this dialog wants, but the password never gets accepted because it asks me again and again. I'm not seeing an error, just it asks me again. (I'm also not seeing an "always allow" button here?)

I look in "Users and Groups" and my name appears as "Conrad Braam" , if I unlock this padlock, I am not seeing an "Advanced" button, so this changed between a guide written in 2016 and now where I am running BigSur.

Either my username is correct, or the program I'm using is bugged , which sounds wrong, because I have the same program on another mac and it works perfectly fine.

If you forgot your user or account name on Mac - Apple Support

conradbraam wrote:

But my problem is now solved. I tried the program again, and I now have joy. :-)

Good computing conradbraam !