What's the easiest way for a beginner to increase file upload size with web host?

I'm not savvy when it comes to using scripts or writing commands, so i'm wondering if there's an more beginner-friendly way to increase the file upload size from 7mb to, say, 64bm so I can upload bbpress.

Ideas?

From what the link at dreamhost instructed me, i need to consider making the following change:

upload_max_filesize = 64M
post_max_size = 64M
max_execution_time = 500
max_input_time = 500

But how?

Cheers