You can update your campaign goal at any point before or during the campaign.
How to get there:
Login to your GivingForKindness account.
Click on your current campaign's name or the edit link to the right of it.
What to do:
Click on the "Setup/Tools" tab.
Click on "General Campaign Settings" on the left hand side.
Scroll to the heading "Overall Campaign Goal" and enter the updated amount.
Click "Save Setting Changes"