I went to Kohl's Department store to purchase a pair of sneakers. When I was checking out the woman clerk at the register asked if I wanted to apply for a Kohl's card and I would save 15% on my purchase. The sneakers were $80, so I figured I'd hang around an extra 10 min, or so and save a quick $12.

Not being too overly bright and probably still half asleep on a Sunday morning, I was under the impression I was filling out (on the electronic keypad) a form for a courtesy card, like which is common in most supermarkets and other retailers. Well, after giving all the info and getting my discount, the clerk hands me a receipt saying I have a $900 credit line at Kohl's.

The thing is, I rarely if ever go there other than today and really don't need it. Should I keep the card anyway and just not use it, and will it effect my credit score in any way if I do keep it or if I get rid of it?

TY.
Con - If you later apply for a loan, it will count as an outstanding debt, because you have $900 in "potential " debt.

Pro- As it is s small amount, I'm guessing that you may not have much of a credit history. You can use it beneficially, by making several small purchases, and paying them off immediately at the first of the month. This will help your credit score, by showing on time payments. You could then close the account next year, after building your credit score. (you need to actaully call the number and close it, not just not use it, or it will still be counted as an active account.)
Keep the credit card and use it. but sparingly. Every time you spend on your card and pay it back in full, you gain better credit score. plus, inactive cards usually carry inactivity fees which are a real pain in the butt. if you're gonna pay anyway, why not get something for it?