I am the admin, but could not find a solutions for it
Do you have Root Access to WHM? If yes, login to WHM with root user and password, go to Easyapache, and recompile PHP and select the modules you want to install in your PHP, it will take few minutes to complete.
To install or modify php modules and extensions requires root access. Easiest way to do so on a cPanel server is using EasyApache within root WHM. However, this cannot be done if you don't have root access and will need to be done by whoever does have root access on your server.