This is frustrating. Like the others here, I only find instructions to remove/revoke a device, not add. Some say to simply install it. Well, it IS installed on my phone (2nd device), but my notes don't sync to it. When EN took away the ability to use this across devices (basic version), I chose my desktop and phone, but have not been able to get my notes to sync to my phone. So I was at a meeting the other day and had no access to my notes. I also discovered Evernote web, but... it's not compatible with my Android phone. So... double frustration for the software that I used to love.