Yet another Steve

My problem was that I was migrating from an older Android device to a new one. (Nexus 5P to Pixel XL) Upon launching the app on the new phone I got a message asking if I wanted to migrate settings from Bittorrent Sync, which I clicked 'Yes' (or continue or something similar) and afterwards could not add a link. After uninstalling and re-installing the app and starting 'fresh' I was able to create a new identity (with my name) and could sync. I hope this helps someone.