You sure can! You can change the pricing/fee model as often as you need. The new fee model you change it to will only affect contributions going forward. A transaction will always stay on the model it was created on.
For how to change your organization’s default pricing model, click here.
STEP 1: Click ‘Edit’ in the sidebar menu.

**Alternatively** You can click the edit pencil to the right of where the goal/dates are in your campaign:
STEP 2: Click ‘Funding & deadline.’ The setting ‘Pricing model’ is the last on this page. It’s lonely down there; say ‘hi’ for us.
STEP 3: SAVE! (Upper right corner)
That’s it. Nice and simple!