how to upgrade from a inherit php version to php 7.2

Hi everyone, my site is WordPress 4.7.18 and its using the version 5.2 of php. I wish to update it to the version 7.2, since the multi php manager on my server says that versions 7.0 and 7.1 are deprecated. However the PHP version that my site is using is an inherited one. I' ve looked to the .htacess and its configure to use php 5.3. I've read about inheritance here PHP Inheritance | cPanel & WHM Documentation and all I could understand is that if I delete the configuration that tells my site to use php 5.3 on the .htacess and change to the version 7.2 on the cpanel that would be enough to do the upgrade. Is that right? I've checked all plugins and theme and they seem to be compatible with php 7. Could some help me please?