I am sorry you are having trouble getting your Edge 810 to be detected by Garmin Express. The Edge 810 does not connect to the computer using the ANT Stick. It uses a USB data cable. Please locate the USB data cable that came with the device and plug it in that way. Then Garmin Express can find it.
FAQ: What can I do if my fitness mass storage device is not being recognized by the computer?https://support.garmin.com/support/searchSupport/case.faces?caseId={e9a42540-68cd-11e3-f27b-000000000000}
