Here are the steps of gmx sign in
You need to search https://www.gmx.com on your browser.
Then click on the ‘login’ button at the upper right corner
After this, A login form pops up
Then enter your GMX email address
Enter password.
By clicking the log-in button, now you can read all your gmx emails.
read also: https://ityug247.hpage.com/gmx-login-accoun.html