Using tahdah Click the links below for easy to follow instructions on how to use tahdah. How to set your email preference How to update your details I have forgotten my username or password How to add payment cards to your account How to set up two-factor authentication How to access online learning How to accept an invitation to be part of an ATC, Branch or Club For easy-to-follow instructions for candidates click here For more guides and tutorials on how to use tahdah click here