How do you rotate intersections on a Mac?

[tandjmohr]

Enjoying the game so far but I can't figure out how to rotate intersections to match existing roads.
I'm just starting out with the vanilla game. Unlocked a couple of achievements but when I want to add another interchange I can't figure out how to rotate it to match the existing freeway.
Any help would be appreciated!

[feigendelta]

Right click. (Get a two button mouse if you haven't got one already. You'll be right and left clicking a lot.)

[tandjmohr]

Thank you I changed the settings to my mouse and it works great!