I'm a bit stumped but I'm sure this is much easier than I'm making it.

I have a product with custom line items. I can create and change the amount, but I can't figure out how to add or change any of the custom line items.

Am I missing something?

Here's how my product is setup:

I have a donation page setup using the Select or Other module where users can choose a donation amount or set their own. Then in addition to that they provide me with their name and which chapter of our organization they belong to.

I have a donor who made a donation but forgot to fill out the chapter info (I can't make the chapter field required because some people are members at large). So I want to go back and add her chapter info but I can't figure out where to get to that info.

If I have to I'll go directly into the database but that's a bit messier than I'd like. There has to be an easier way to do this, right?