This feature is also known as HTTP Authentication. Here’s how to do it:
- Log in to Plesk and choose “Password Protected Direcotires” under your domain
- Select Add Protected Directory. Enter in the directory name (wp-admin), location (probably httpdocs) and title of the protected directory and click OK.
- Once the directory is added, select the directory. This will allow you to set a user and password to access the directory.
- Click Add New User and enter in the username, secure password, and then confirm the password, and click OK.
You will now have to enter a username and password when accessing the directory you configured.