Microsoft Edge browser is not finished yet. Microsoft chose to release Windows 10 and Edge before they were 100% ready for prime time. They are getting better with each update release. Early next year (2016) Microsoft Edge should be fully functional (accept apps, etc). Eventually, Microsoft is going to phase out Internet Explorer in favor fo their new browser, Edge.
I got a note from Microsoft asking why I didn’t use Edge.
I replied I preferred a browser with an HTML editor aboard.
Never heard back.