This article applies to the 123-reg control panel and the following browsers: Chrome, Firefox and older versions of Internet Explorer.
If you are logged in as one user but due to browser cache can't log out in order to login as another user, simply enter the following into the address bar :
Tip: https://username:password@www.123-reg.co.uk/secure/
Replace username with your 123-reg account username and replace password with your 123-reg account password.
Entering the above into your browser with the relevant details for your 123-reg account will log you out of the existing account and then automatically log you into the other 123-reg account.