Okay I may be dumb for this but..

We have a pack n play which is what we are using as my LOs bed. It has the removable changing table and bassinet and currently my 9 week old sleeps in the bassinet. 
As soon as she out grows it, I plan on sleeping her in the regular pack n play but I'm confused. Do I sleep her where the bottom pad is now or do I lower it all the way down? Dumb question, I know but never had a pack play my other daughter used a regular crib!