You can add/edit activity counts on your Athon page from your BetterWorld account. Here's how:
First, head over to your account and click on Peer-to-Peer Campaigns in the left menu.
Next, click on Edit next to the donation page you wish to update.
You can now scroll down until you see "A-Thon Settings"
Edit the activity count and click Save!
That's it! You're all set! This information will transfer to the organization's admin and your main page!