Trying to relate 2 Entries together I have two channels, Courses and Instructors. In Courses I'd like to have a an entries field called "Instructor" so that this will display on the courses page.

I can't seem to figure out how to do this. I have found a few tutes but nothing I have tried has worked. Whats the best way of doing this?
Everything you need to know is in the Relations part of the official documentation.

You essentially want to add an Entries field to your Courses channel and then when you set it up pick Instructors as the source. If you only want to pick one instructor, just set the limit to 1. How you then use this in the templates can be found here.