Log in this way:
Enter your username and password in the appropriate input boxes.
If you log in the first time, please collect this data from your welcome message:
Your username (login name)
Each single login attempt creates a new securitycode.
Type the displayed chars into the appropriate input box.
After entering the information for username, password and securitycode click the button "Login"
You can copy your password from your welcome message (select, hotkeying Strg + C)
and paste the password to the password field by hotkeying Strg + V.
In this way you can easily avoid typos and misinterpretations.