It's too late now since someone has already bid on your item. For the future, if you want to do a GIN (Get It Now price), it is a price that is set in advance that you will accept for your item. To do this, simply go to the bottom of your auction where it says "Show Advanced Options" and click on there and you will see where you can put in a GIN number. Also where you put in the number of days you want your auction to be. If you already knew this, forgive me but you sounded like you did not in your comment earlier. Just trying to help. :)
FYI you will not be able to set GIN until you have completed a certain number of auctions (I think it might be 15). and as you gain experience (buying and selling) you will "unlock" additional features, such as using bold in your auction titles, GIN, etc. you will receive notification when these things get unlocked on your account. WELCOME to Listia! I love this site, and I have a lot of fun with my auctions. ...as long as you remember to have fun and not take people's comments too seriously, you'll be successful! my advice is to answer all questions (even the stupid ones) and try to stay positive. I find that if I presume that everyone has good intentions, it makes for a better experience for everyone. I have even made some nice friends on here. so don't give up and keep that pretty smile on your face :D