What do you mean by "haven't been able to access" the prior returns? Can you at least find them? If you are not finding the 2017 returns at all, we can tell you how to look for multiple accounts.
Or have you located the 2017 returns, and are they in that same account that you are using for 2018? Were they prepared in Free Edition, and is access locked and it asks you to upgrade and pay for them? If so, then in order to unlock your prior returns, you have to pay for a 2018 product in advance in PLUS or higher.
We can tell you how to pay to unlock prior returns in the same account, but you need to make a product decision first, so you'll know "what" to pay for. If you do want PLUS, we can tell you how to downgrade to Free Edition by using "clear and start over", then once in Free Edition you can upgrade to PLUS. But you may need to still upgrade to a higher product later on after that, depending on what all is in your return, especially if you have a self-employed business.
I don't know what edition you need. It depends on what kinds of forms you need in your return. If you have a self-employed business that needs Schedule C, then you can use regular Self-Employed (i.e. no live tax pro) at 119.99 for Federal and 44.99 for a state return.
If you DO want Live Self-Employed, see these FAQs:
FAQ: What is TurboTax Live?
<a rel="nofollow" target="_blank" href="
https://ttlc.intuit.com/questions/3859448-what-is-turbotax-live">https://ttlc.intuit.com/questions/3...>
FAQ: How do I connect with a tax expert in TurboTax Live?
<a rel="nofollow" target="_blank" href="
https://ttlc.intuit.com/questions/4124827-how-do-i-connect-with-a-tax-expert-in-turbotax-live">https...>
If you do NOT want Live Self-Employed here's how to remove the Live feature. There are 2 methods depending on how you got there.
FAQ: How do I remove TurboTax Live?
<a rel="nofollow" target="_blank" href="
https://ttlc.intuit.com/questions/4140092-how-do-i-remove-turbotax-live">https://ttlc.intuit.com/que...>
