Step 6 covers two separate things: selling extras, and collecting charity donations.
Merchandise and extras
The first section is for anything you want to sell alongside the entry. Merchandise might be hats or t-shirts, but the same section works for extras like camping or bus transfer, so it is worth thinking beyond branded goods.
For each item you complete a set of fields including pricing, description and any custom fields you want to add. You can also upload photos of the item.
Charity donations
Underneath the merchandise section is Charity Donations. Add any charities you are partnering with here. They appear in the bottom section of your entry form, where participants can choose to make a donation to your causes as they enter.