You will need to upload a php.ini file to your root directory (where Concrete5 is installed). Most web hosts should allow this. If they don't, you will want to get a better web host.

Below is what you would have in the php.ini file if you want to increase the limit to 32 MB.



For your convenience, I have attached a php.ini file (in ZIP file).

Also, you should contact your host's tech support to see what the PHP file upload size maximum is.