If you need to enable or disable PHP extensions, you can easily do this through the BrainyCP control panel. To proceed, log in to your BrainyCP control panel as the root user.
The login credentials can be found in the email you received upon server activation or in your Client Area under the «VPS Settings» section.
Go to the «Install and configure PHP» section.
Go to the tab with the desired PHP version
Find the module you need in the «Name» column
Tick the box in the column for the action you want to take: «Install», «Remove», «Reinstall» or «Enable», then click the corresponding button at the bottom of the table.