In Postmypost, go to the “Accounts” section and click “Connect”.
In the window with the list of social networks, click “Connect” next to X.
An official account connection window for X to Postmypost will open, detailing what data and permissions Postmypost requires. Ensure you agree to grant access, and click “Connect”.
After successful connection, you will automatically return to Postmypost, where a list of available accounts to connect will open. Check the box next to the desired accounts and click “Connect”.