To access your account security settings, click on your name in the top right hand corner of the screen and select "Account security" from the drop down list:
Here you can change your password and activate your two-factor authentication for extra security.
To change your password, enter your "Current password" then your "New password" then retype your new password in the "Confirm new password" field.
To activate your two-factor authentication, click "Generate QR code" the below window will appear:
Download an authenticator on your mobile phone. You can use Google Authenticator for example
Scan the code with your phone camera or type the long code highlighted in blue
Type the token code which your phone gives you in the field and click "Confirm QR code"
Going forward, upon logging into your Heydoc account you will need to enter your usual password as well as the code your authentication provides you with:
You will be able to deactivate the two-factor authentication at anytime from this "Account Security" section.