This feature is designed to find an activity/task to your account.
Click on Find activity
In the linked pane menu click on the arrow of the “Send to activity” option and then select the “Find an activity” option.
Select an activity
On the list that will be shown click on the activity, you want to link up to.
After selecting activity
After the selection, you will be forwarded to the selected activity details page.
Here you are able to change details of the activity.