WARNING: Deleting your camera from OWLR does not stop Motion Alerts. You MUST turn off Motion Alerts first before deleting.

Step 1:

Your camera can be deleted from the settings screen, which can be found on the lower right hand side of the thumbnail on the your camera view:

You can also find it on the upper right hand side in your individual Camera View.

Step 2:

Clicking on the Settings icon will bring you to the Settings screen, where you can "Remove Camera" using the button at the upper right.