There are 2 ways to do this.
1 Login. Then as you search for each pin there will be options to add it to your trades, wants and or owns list.
2. Is to go to My Pin Pics, Log in, and it will allow you to go through the entire Database, 100 pins at a time, either with pics or text only. There will be check boxes for Owns (O), Wants (W) and Trades (T). Using this option make sure you click on "Done" when u=you are finished adding you pins.
It can be daunting at first but once you get them in there if you update them as they come in and go out it is pretty easy.
Good Luck and if you need any help feel free to e-mail me.