I am totally new to Quickbase Administration. (our admin left the company)

I little caveat to this, is you need to be an 'Administrator' in the application.  

If, so, just right click on the field name in question.

Select "Edit the field properties for this field..."

Then you can change the title to the field.

 

This is the answer to your more immediate questions,  

There is a lookup field that I need to change the names on.

Once you get more comfortable you can start diving into more relationship.