What do you want to find out?
In Calendar view, double-click the day you want to delete.
On the right side of the screen, click on the button at the end of the line you want to delete. This will delete the visit.
Then click Save.
If you want to delete all occasional trips, or if you want to delete the trips that were recommended by the AdWise feature, you can do this by clicking on the Useful tools menu located in the top right corner and click Leave fixed trips only!