In your store administration, view the Fundraisers section:
Toggle the Feature Campaign on the Store Admin switch to On. This will create a new category in your store titled Fundraisers.
To add Fundraisers to feature in the store, click the Add button. Then copy and paste the fundraiser URL into the form that pops up.
You can feature as many fundraisers as you would like. Just click Add again to add as many as you like.
Shoppers and Donors can view the Fundraisers section of your store to see any Fundraisers you have featured.