Install the plug-in using the following step-by-step process:
Download the zip package of Tapatalk Plugin for MyBB to your computer.
Unzip the package. You should see two folders ('mobiquo' and 'inc').
Upload the entire 'mobiquo' folder to your forum system root directory. For example, if your forum URL is http://www.mysite.com/forum, your mobiquo folder should be at the address http://www.mysite.com/forum/mobiquo/.
Upload the 'tapatalk.php' file from 'inc' -> 'plugins' folder to your forum system 'inc' -> 'plugins' directory. For example, if your forum URL is http://www.mysite.com/forum, your tapatalk.php file should be at the address http://www.mysite.com/forum/inc/plugins/tapatalk.php.
Login to AdminCP, go to 'Home' -> 'Quick Access', click 'Plugins'.
Find out 'Tapatalk' plugin in 'Plugins' section, click 'Install & Activate'.