That is strange, as MySQL support is actually already enabled.
If you visit https://dubmusicproductions.com/phpinfo.php
and search mysql, you will see plenty of mentions of this. Both mysqli and mysqlnd support is enabled.
For Jamroom 4 you have to enable the OLD "mysql" extension - that's been removed in newer versions of PHP. Jamroom 5+ uses only mysqli.
Founder and Lead Developer - Jamroom