From teh share link at the bottom of the screen you can create a link that will let anyone who has the link view your family tree. Make sure you do not use the option to create a link that gives them the right to edit the tree.
You might also want to make the link as if it were for some obvious ancestor instead of from your box in the tree or some random person. To create a link from a dead relative, you'll have to temporarily make them alive.
