Step 1: Login to the cPanel account.
Step 2: Open the 'File Manager' and select to go to the Web Root and click 'Go'.
Step 3: Then scroll in the right-hand panel to the file php.ini and right-click it.
Step 4: In the pop-up menu select 'Code Edit'.
Step 5: In the Search text field type upload_max_filesize and press enter.
Step 6: Enter the size that you need to change.
Step 7: Open the find pop-up, again and in the Search text field now type post_max_size and press enter.
Step 8: Enter the size that you need to change.
Step 9: Click Save changes.