How do I find my username

Go to System Preferences --> Users & Groups. Click on the padlock at the lower-left corner and input your administrator password. Right-click on your account name in the left side pane and select "Advanced Options." You should see a dialog box come up that will allow you to change things like your account name, full name, stuff like that. This will show you what they're set to be now, so if you want to change them, you know where and how.

How to find the forgotten username?

How to find the username using Recovery HD without resetting password?

We are not going to reset password here, but just find out the username.

Start the computer,then press and hold down command and R keys to start into recovery partition.

When you see the Apple logo, release the keys.

Wait until OS X Utilities window shows up.

Move the mouse to the menubar at the top and click "Utilities", then select "Terminal"

from the drop down.

Terminal window will appear.

Type in resetpassword and press enter on the keyboard.

Reset Password Utility window will open with Macintosh HD selected.

If not, elect Macintosh HD.

Quit Terminal

The popup menu box under “Select user account” should show the username.

If not, click inside the box to reveal it

Note down the user account name.

Quit "Utilities" and "Restart".

AriPincess wrote:

Hi thanks for your response, I tried this from the beginning. The problem is that when I click on the padlock it asks for both username and password and neither my former username or the one I tried to change it to are accepted as accurate.

In the terminal.app copy and paste:

users

after you hit the return key it will give you the login names of the users currently on the system

If you need to see more of all users, copy and paste:

ls -la /Users

AriPincess wrote:

Hi thanks for your response, I tried this from the beginning. The problem is that when I click on the padlock it asks for both username and password and neither my former username or the one I tried to change it to are accepted as accurate.

That's odd. I don't have to input my user name, just my password.

Nobody at Apple knows your username, it's your secret and now that you have forgotten it .....

Erase the machine and setup a new one, write it down this time.