Yes, that's no problem! You'll have to go to "My Account" (if you're currently working on a family tree, there's a button on the upper right side of your screen) where you can see stuff like your E-Mail address and username. Below is a list of your family trees, and below that list the option "Create or import new family" that allows you to either start a new family from scratch or import a family tree you created on another website.
Hope this helps!
