First of all -- THANK YOU!
Now, if you're doing this from a computer, click on your menu drop down in the upper righthand corner.
Then click on our project under "backed projects."
See that green banner on the page that says "You're a backer!"? Click on "manage"
There, under pledge amount in green type, you should be able to add any amount you want.
The BatHat Raincoats are +$60 each. The other add-on items are in a graphic on the Kickstarter page - each one listed with a price next to it.