Can i file prior years taxes for state and federal. Forms are not available. What do I do next in order to file my state taxes?

Please explain exactly what years you are referring to, and what returns you need to file.   First you said "state and Federal", then you ended with a question only about your state taxes.  What have you already done?

Tax year 2016. I was able to fill out the forms for Federal taxes but, when I tried to fill out the state form the message said they weren't available

How and when were you preparing the 2016 Federal return?    Were you using the online website prior to the October shutdown and hadn't finished?     Hopefully, you haven't recently been using Online TurboTax, since that is only for 2017 returns at this point in time.

Sounds like you used the current 2017 online version.  If you did just enter your 2016 info online then you need to clear it out and come back later to do 2017 in it.  How to clear it out, <a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/questions/2586254-using-clear-start-over-in-turbotax-online">https://ttlc.intuit.com/questions/2586254-using-clear-start-over-in-turbotax-online</a>

Thank you. But, I already paid

Well you could not have paid for the 2017 ONLINE program yet ... so you must mean you have already paid for the 2016 online program ... if so contact support and get a free download pushed your way so you can complete the 2016 return.

Contact TurboTax support and speak directly with a TurboTax support agent concerning this situation.
See this TurboTax support FAQ for a contact link and hours of operation -<a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number">https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number</a>

TurboTax Online only supports the current 2017 tax year and the prior 3 years (2016, 2015, and 2014).   The latter 3 have to be prepared in desktop software (CD/download). Each tax year requires different year software; i.e., 2015 can only prepare 2015 return; 2014 software can only prepare 2014 return, etc. Prior-year returns cannot be efiled; they must be printed and mailed.

NOTE:  If you prepare returns for multiple years, do NOT mail them in the same envelope. Mail them separately.

You can see prices for those 3 prior years at the link below if ordered directly from TurboTax, but you may also be able to find them at a discount at reputable retailers like Amazon:
https://turbotax.intuit.com/personal-taxes/past-years-products.jsp