Make a strong password and make it in numbers and letters
Is there a solution or where can I modify it? What is the name of the file

@Robot
Not quite sure what you mean, password is entered by user, not by osclass.

I mean, when a user wants to enter a password
It is more than seven characters and there are numbers inside the password
Also, there is an error when the user wants to retrieve the password only when he writes one letter that he can record, so this is a mistake that you can try to make sure
I want the user to not retrieve the password with one letter

Ok got you, jQuery library needed for that.

Can you help me or guide me in any files that I can correct and modify?

@Robot
You may search for inspiration i.e. here:
https://stackoverflow.com/questions/1388609/jquery-password-strength-checker

Osclass plugin exists for strong password. Use google. ;-)

where can me modifie this code when i get it in som folder user-forgot_password.php  or where please help me and give me a small step

I think you will want to add it into user-register.php

i add code but is not workin any solution please

@Robot
Use google.
https://www.jqueryscript.net/blog/best-password-strength-checker.html
https://www.jqueryscript.net/demo/Animated-Password-Strength-Meter-with-jQuery-Bootstrap/demos/bootstrap3.html