An outstanding balance is how much you owe after your last payment is applied to last months balance. Available credit is how much more you can charge on the card given your credit limit. There's about $402 unaccounted for though. My guess is you've spent about $402 this month and that hasn't been added to your outstanding balance yet. If you're available credit is $104, and you have a credit line of $700, you need to pay ~$600 to pay off the credit card, but this might vary some based on your interest rate (interest rate will likely only be applied to $194 if you pay off your card this month, otherwise it will be applied to the balance you roll over to next month).
I suggest you stop using your credit card immediately until you pay it completely off.