How to set password on backend user-creation?
In 5.37 there was a bug that hid the password field. This is fixed in the 5.37 branch but 5.37.3 hasn't been released yet, otherwise it will be in 5.38. If you're on 5.37 you can just replace the CRM/Contact/Form/Task/Useradd.php file with this one: https://raw.githubusercontent.com/civicrm/civicrm-core/5.37/CRM/Contact/Form/Task/Useradd.php
Note that in wordpress if the wordpress configuration says to allow anyone to register, then the password field is intentionally hidden because it was decided that the user should set their own password using the link in the email.