Problems with large uploads

I'll need to occationally upload a 4 meg pdf file. I went into function.php and did a quick edit so the script doesn't check file size for admins. When I try to upload the file, it just doesn't work. the post goes through as if I hadn't added an attachment.

I have the attachments as files hack installed and it works fine for smaller attachments. I read something about php having a default upload file limit of 2 meg and you'd need to edit php.ini. I have no idea what php.ini is and I'm sure that I don't have access to it.

Any suggestions?

I want the security that the attachment file offers so I can restict downloading but can't get the upload to work unless I upload it via FTP.

[Gimp]

in php.ini the max size of the file to be uploaded is 2MG by default.
So just change it there.

[Mutt]

where do I find php.ini?

this sounds like something I'm not going to have access to.

[Admin]

Only your host can alter php.ini for you (and he will also need to restart the server).