STEP 1 : Login to cPanel ( Guide here )

STEP 2 : Navigate to Software -> Select PHP Version. Click on Select PHP Version

STEP 3 : Beside PHP Version X.X, there is an arrow down button. Click on the arrow down button

STEP 4 : Select a PHP Version you desire. In this example, we are picking PHP Version 7.2

STEP 5 : Click set as current

If everything is succesful, you will see that the current PHP Version no longer shows native, but shows the PHP Version you chose ( In this scenario, PHP Version 7.2 )

STEP 6 -  ( Optional ) You can install/uninstall PHP Modules by ticking/unticking them on this page too