If you’re an iOS user: tap on the 'Overview' tab on the lower left corner of the app, then tap on the Goal you'd like to edit. On the top right corner, you will see an 'Edit' option.
If you’re an Android user: Select the Goal and in the top right corner, and you will seethere's a pencil icon.
From here you can update your cover photo, the name of the Goal, the target amount, what Rules are applied and who can save with you.