Hi and welcome here.
When you open the facer.io Website and klick the green button "Explore the collection" you will get a search window on the upper right.
Write your Username and you will get on another page with your watch face(-s). There you will find a round, green button to sync it.
Or - simply follow that link:
Another way is to klick here on your Userbutton and follow the link to your Facer-Profile in the upcoming Information-window.
Phantasico aka GAUSS