The website works if you have the MRDVR (Multi Room DVR) feature on the DVR you wanted to access.
You can not watch the shows on your PC, but if you want to delete recordings, or setup new ones, etc.
you can do that here. http://www36.verizon.com/fiostv/MyAccount/members/Home.aspx
This is not a personal attack, but the URL is in your post so you get the chance to address this one. Why is it so ridiculously hard to find that URL by just visiting the verizon website. I always need to look on my set top box or visit the forums to find the URL. I have not even been able to find it using the search on the main verizon page.
Bookmarks work great if you have only one computer. The whole point is to be able to manage the DVR no matter where you are. This should be WAY easier to get to from the verizon.com site.