What’s Proper Delta Buddy Pass Etiquette?

FlyerTalker Debra79 asked this question in the Delta forum:

I’m getting ready to fly DL JAX to BCN with a friend on her cousin’s buddy/companion pass. Could someone please help me with accessing the buddy pass etiquette page or just post the content here? Thanks. 

Whether you know the answer and want to add a few cents, or have been curious yourself, come join the discussion in the forum here.