As the campaign Admin, you can change the funding goal per participant.
Change Funding Goal by Participant
To change the goal by participants, go to the participants section of the Groups & Participants tab and click on "Edit Goal":
Change Funding Goal per Participant by Group
To change the funding goal per participant within a group, go to the groups section of the Groups & Participants tab and edit the "Goal per participant" column:
*Note: Type in the number and press Enter on your keyboard to update.