Archive link display more posts on page?

Hi all. I have a very customized WP site here:

http://www.contrarianbee.com/

On the “Grab Bag” sidebar there’s an archive link on the bottom which takes you to posts which have the “Grab Bag” tag.

How do I get the archive page:

http://www.contrarianbee.com/?tag=grab-bag

to display more than two posts per page? Like maybe 10 or 20?

Thanks,
Matt