Everything is lined up when editing the project, but when I build it and run, the positions of everything is messed up. How can I fix this?
Sounds like a problem with the GUI and the screen resolution to me. Try setting the resolution and aspect ratio in your editor window to the same values you use in your build and then place your texts/objects again.
A better (but more expensive) approach would be, to try and design everything resolution independent ( http://forum.unity3d.com/threads/52571-Resolution-Independent-GUI could be a starting point for that )