In a nutshell:
- Locate the php.ini file in the folder your upload script resides in. If none exists, install a new php.ini file from the PHP config icon in cPanel. Then, use the File Manager to rename php.ini.default to php.ini
- In the php.ini file, locate the line called 'upload_max_filesize = 2M'
- Modify that entry to read 'upload_max_filesize = 10M', or whatever your script requires. (M = megabytes)
- That's it!