How to use the action bars?
 

I recently installed from http://www.wowinterface.com/download...68-RealUI.html.

The ui looks good but I have no idea how to set my shift click and alt click to my visible action bar that now floats above my party/raid frames.

That UI uses Bartender. But do you just mean creating macros? Should be the same as always.

Type /bartender.
Click the button labeled "Bartender 4".
Click the Keybind button.

Or you can press ESC and select Keybinds if you want to do it in a list. Make sure to edit the Bartender binds in the list. You will probably have to scroll.

To key-bind in Bartender4:

Q: Where are my keybindings? And how do i bind new keys?
A: Bartender4 buttons do not automatically inherit keybindings from the Blizzard bars (except for Bar 1), you have to use the new KeyBound to re-bind your keys. You can access KeyBound by its slash command (/kb) or through the button in the BT4 config. Hover a button, press key → voila!

From the Bartender4 page here at WoWInterface. :o