To raise the PHP Upload Limit for your website simply do the following:
Create a blank text file called php.ini (if one doesn't already exist) or add this to the one that exists.
Put the following line in it:
upload_max_filesize = 10M
(replace 10M for whatever size in Megabytes that you would like the max upload set to)
Then place the file in your public_html folder or deeper in your dir structure (preferably only where you need it) and that's it.
Items that are to be global can be in a php.ini file in your public_html folder, other settings that you only want to apply to a specific application can be in another file inside the application folder.