Take a piece of dental floss and twist its ends around two screwdrivers or similar instruments (but not your fingers!). Then carefully slide the dental floss between the sticky tape and the helmet until NUVIZ Mount comes off. You may be able to use the same piece of sticky tape more than once to reattach NUVIZ Mount, depending on its condition after removal of the first attachment, and depending on the time it has been attached. Do not reuse the same piece of sticky tape if you suspect its ability to attach as firmly as it did the first time.
You can watch a video on how this is done in the NUVIZ app > tap NUVIZ > Guides. Or check out other videos on the web.