phpBB Add User Extension allows an administrator of a forum to add a user into the phpBB database.
Clone (or download and move) the repository into the folder phpBB3/ext/phpbbmodders/adduser:
cd phpBB3
git clone https://github.com/phpbbmodders/phpbb-3.1-ext-adduser ext/phpbbmodders/adduser/
Go to admin panel -> tab customise -> Manage extensions -> enable Add User
phpBB Add User Mod is distributed under the terms of the GNU General Public License 2 (GPL). A copy has been included in the package (license.txt).