If you left some mistake the you can easily edit or delete the images / articles from your panel.
Lets we understand it in very simple steps.
(Delete the service)
STEP - 1
Just click on "Delete" button to delete the service.
A popup will open to confirm your delete operations, just click ok to delete.
( Edit the Service )
Step - 1
Just click on "Edit" button.
It will fill the values to the left section, from where you were adding services.
Step - 2
Edit your Content or Image according to your service.
Finally Click on "UPDATE" button to update your service.