See username after login on landing page, restrict access to the page and logout

Thanks Ray and hello

In the access form I used the Triger "Ani form post" because in the tutorial of use of the extension there is a screenshot where it appears like this.

Assistant screenshot

I have changed it to press the form button and it still does not work and it gives several PHP errors:
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Notice: Undefined property: WA_MySQLi_Auth::$Log in /Applications/MAMP/htdocs/MCC_01_edicion_DW/webassist/mysqli/authentication.php on line 274

Warning: Cannot modify header information - headers already sent by (output started at /Applications/MAMP/htdocs/MCC_01_edicion_DW/webassist/mysqli/authentication.php:274) in /Applications/MAMP/htdocs/MCC_01_edicion_DW/webassist/mysqli/authentication.php on line 445
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When you say:

"You would probably want to use a trigger of a form button press event, and then add filters to find the username and password entered in the form."

Is it in the recordset where I have to introduce a filter? Which? Maybe some WHERE clause. None of that is said in the tutorials

Thanks again