Step 1 : Log into N99panel. From under N99panel dashboard, click 'VHosts/Websites'

Step 2 : You will see the list of all the VHosts. Please click 'Details/Manage' link against the appropriate VHost/Website

Step 3 : Scroll down to PHP Version and click the pencil icon against it

Step 4 : Now select the PHP Version, and click 'Change PHP Version'.

PHP version change will lead to restart of FPM manager. If you do not see the 'Completed' message, you can check the same from 'Dashboard' » 'Tasks' to verify whether the necessary action is completed or not.