Need to make changes to a custom activity you’ve already created? Here’s how.
Go to the Admin area.
Click Marketo Custom Activities.
Select the custom activity you want to edit.
Click Custom Activity Actions and select Edit Activity.
Edit Activity Type appears. In this example we’re fixing a typo.
Enter your new info and click Submit.
Your custom activity is now edited!
If your activity was a draft at the time of editing, it remains a draft. If it was published, the status changes to Published with Draft.