Go to the link.
Choose your class.
Fill in the talent build.
The URL at the top of the page should update according to the talents you choose, when you are done just copy and paste the URL.
Same as above, the URL updates with the changes you make to the tree.
Note: I will be adding talent builds for all classes and specs in the future, however I will need your help (since I am not that knowledgable with all classes). If you think you know what you're doing with your particular class/spec PM me with a talent build (a description of the build would also be helpful).