How do I delete previous recording from my DVR?
You can delete the recordings only with the help of one of the applications installed. The module name is called eDVR Manager Monitor and allows you to either preview the streams and delete/manage the recordings. In the main window, look on the lower-left section and then right click a recording. A menu should appear from where you can delete the selected recording.
You can download the application using the link: http://www.webgateinc.com/wgi_htdocs/eng/dcenter/data/wgi_eng/eDVR_Manager_v2.6.4.zip