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Just enter your preferred email address in the 'Email' field and click the arrow. Depending on your email address, you can then register with your name and a new password or 'Sign in' using a pre-existing Google, Facebook or Yahoo account (see below for details).
Just enter the email address you wish to use in the 'Email' field and click the arrow. You will then be given the option to 'Sign in' with Google, Facebook or Yahoo.
Just enter the email address you used last time, in the 'Email' field and click the arrow. You will then be redirected to Google's website to sign in, then brought back to Thinking Kit. This is also the case for Facebook and Yahoo.
Click 'Problem signing in?' under 'Remember me on this device' and follow the instructions.