Some plugins including CSV Import and Neatline may need to execute code using the command-line version of PHP. If your plugin requires this it can be enabled by editing the file at application/config/config.ini and modifying the background.php.path = "" line to the following:
background.php.path = "/usr/bin/php-cli"
Note: Newer servers on Reclaim Hosting have a new php-cli path of /usr/local/bin/php. If the old path doesn't work try the new one.
Editing files is easy within cPanel by using the File Manager.
Simply navigate to the folder location (application/config within your Omeka directory) and click the file and you'll have the option for a code editor where you can find the line to edit: