To edit an existing activity type, head over to the Control Panel, under the Data Types section, click on Manage Activity Types.
The list of existing activity types will appear, you can search for the activity type you want by scrolling through the list or entering the activity type name in the following field.
Click the 'Pencil'-icon.
The following dialog will appear.
After editing an activity type, click the Update button.
Click the OK button, and you are done.
1. Ensure that you are a User with 'Administrator'-rights set up to be able to access Control Panel.