You can also change the settings in php.ini file. Please login to cPanel >> File Manager >> Under /public_html folder, create a new file with the name php.ini .In the php.ini file, locate the line which you would like to implement and click save. You can also locate the php.ini file in any of the the folder under public_html which you would to have.
You can apply custom PHP settings on a per-folder basis using a local php.ini file.
For example, you need post_max_size and upload_max_filesize set to 200M in a directory. For this purpose you should log in your cPanel and go to the File Manager. There navigate to the directory where you'd like this setting applied. In this directory create a file php.ini containing: