When you visit the BGG page for any game in your collection scroll down to see all the various fields you can use to enter personal info about the game.
Trade Condition - Shows when people click on "Propose a Trade with this User".
Comment - Shows when people click on the "comments" link at the top of a game page next to the ratings link, and also as a column on your collection list links when clicked from your profile page.(For Trade, Want to Play, etc)
Wish List Comment - Seen when someone clicks on your "Wish List" link from profile page.
Version - Lets you select the edition you own from a checklist and will show when clicking on the collection links from your profile.
All of these fields are entered by clicking on the relevant black area you see under "Item" at the bottom of the game page once you've added one to your collection.