@katherine: You have until your extended return to put money into a SEP. Only a traditional and ROTH IRA have until April 15th to make your 2012 contributions.
@Kate: Yes they extended it until the end of 2013.
@DeLaCruzTine: if it hasn't been received and you filed it electronically it would seem as though it didn't go through. Maybe try filing it again and see what happens. You can always check on the refund at www.irs.gov
@Larry: That would depend on your income level.
@HavebeencheckingIRSsite...: It is possible, I've heard there were some delays this year in processing returns and refunds. If anything maybe give them a call at 1-800-829-1040 to find out if there is a problem.
@SANDRARUFO: You can get it at www.irs.gov and yes you need to send it in at the same time you file your tax return
@Jcayers: If you're referring to health insurance premiums you can deduct them for yourself and your dependants on Schedule A under Medical Expenses
@Kim: Yes as long as you have records of the amounts you paid personally or by loans you can claim the education credit.
@escher: If you're only source of income was SSI and you don't need a federal return you may not need to file a state return. Check with the state's taxing authority to ensure.
@Yvette: If you cannot pay the amount in full I suggest sending your return in with Form 9465 to request an installment agreement and make a small payment with the return at the time you send this in to them.
@DeLaCruzTine: If it says it's accepted and processing then you'll need to wait. Worst case give them a call at 800-829-1040
@JohnM: If you converted a traditional IRA to a ROTH IRA you would have to pay tax on it at the time of conversion.
@bbrobbs: This is not a simple answer as it would require additional research and information from you in order to determine what you would need to report from it.