You can learn how to reconfigure backups from the Windows Home Server console help. Click on the Help button in the console, then navigate in the tree view to the topic "Computers & Backup/Managing and Configuring Backups/Configure Backup". that page will tell you to right click a computer on the Computers & Backup tab, then select "Configure Backup" from the context menu that will appear.
You might want to read some of the other topics in the help file; there's a lot of useful information there.
I'm not on the WHS team, I just post a lot. :)