You can always use a phprc file with this:
upload_max_filesize = 64M
post_max_size = 64M
max_execution_time = 500
max_input_time = 500
Step by step?
Create a text file named "phprc" (no extension).
Paste the above code, changing values as you find necessary.
FTP to your site. Be sure that you can view invisible files.
Look for a directory named ".php" and navigate to it. (The fore-period/fore-full stop makes it invisible, thus the need to view invisible files/folders.)
Open that directory, and find the directory that corresponds to your php version (5.3 or 5.4). Open that directory and upload the phprc file to it.
Go back to your control panel reboot your server, if you're on a VPS.