I understand you are trying to delete a Slingbox from your directory list. Please follow the steps below:
Steps to follow:
1. Mouse over directory on the menu bar, the Directory opens and displays all of the Slingbox devices associated with your Sling account.
2. Hovering the cursor above a Slingbox highlights it, and moving the cursor over the triangle to the right of the Slingbox name reveals more information in a sub-menu.
3. In the sub-menu, the very last option is to delete the Slingbox.
4. You will be asked if you want to delete the Slingbox, select yest and your Slingbox will be deleted.
If you have further questions or concerns on how to delete your Slingbox, please look at the link below:
Sling Media Support!