How do I set up a one-to-one relationship between tables?

Okay...  I am a novice here.  How do I set this up?  I have figured out how to link the two tables, and based on your analogy, I now know which table to name as parent/child.  So, that is helpful.  However, this misses the core of my question.  How do I do it?  How do I insert a data column into A from table B?  Please, bust it down to 2nd grade level.  That's where I am at with QuickBase.  You can talk college level Excel with me, but training wheels are still on here in QuickBase.