If setting a tomato plant I bury the stem so more roots grow along the stem. Can you do the same thing with a pepper plant or does it need to go into the ground at the same level it was raised in the six pack?
Setting out pepper plants
No don't do the same thing as tomaoes. As drthor says plant then at the same level they are at now.
Yes, you can bury them a bit deeper and the roots will grow out of the stem.