How to edit php.ini file and add extensions to 123-reg site?

I need to install the sqlsrv driver to a php site hosted on 123-reg. when I load up the website it only says: “Failed to get DB handle: could not find driver”

I can see on phpinfo() that the php.ini file is stored in a folder called etc that I can’t seem to find anywhere. The file path is “/etc/php72.ini.d/php.ini”

I also need to copy over the drivers into the extension folder which I can’t seem to find either.

How can I find php.ini or create a new one and use that. And how can I install drivers to 123 reg?

I’m using php 7.2.

Any help would be appreciated!