How can I get more file size for posting info?

Greetings!

I attend three judo events in the US:

San Jose Buddhist Sensei Memorial Tournament - over 700 judokas.
California State Judo, Inc. State Championships - over 500 judokas.
Junior US Open, in Florida - over 500 judokas.

Personnel that run those events have asked, in the past, that I post information on their events and the results of those events.

Since I do not have a webpage, I use this forum. However, when I attempt to attach a file, it says that I am out of file space.

I know this forum is free.

What if anything can be done to increase my file size for attaching files? If there is a charge, how much money for how many GB of files?

Thanks

Jerry Hays
Santee (San Diego) California.