New answers tagged account-management
password-assistance page can help you. There are 3 options: Having trouble signing in? I don't know my password I don't know my username I'm having other problems signing in Select the second option(I don't know my username) and follow the instructions.
In the Google Accounts Help there is a troubleshoot that could help you: Problems signing in to your account
There are various browser add-ons that let you switch between sets of cookies. Personally, I use Multifox for Firefox. Install the add-on, and it creates a Default Profile. Sign in to Github with one account, and then create a new profile, and sign in with your other account. You can now switch back and forth by switching which Profile is active.
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