I don't use Online TurboTax, and they have recently changed some of the screens in the Self-Employed Edition, so I can't walk you through the directions for deleting a self-employed business in the Online version. You'll have to see if anyone else responds in this thread. Since this thread already has an answer, however, it has been moved to a different queue, and is less likely to be seen by the community.
Your best bet may be to start a new thread by asking the question something like this: "I started entering a second business by mistake. How do I delete the business I don't need?" You can start the new thread at this link:
<a rel="nofollow" target="_blank" href="
https://ttlc.intuit.com/questions/new">https://ttlc.intuit.com/questions/new</a>
Here's info on Educator Expenses:
FAQ: What is the Educator Expense deduction?
<a rel="nofollow" target="_blank" href="
https://ttlc.intuit.com/questions/1900100-what-is-the-educator-expense-deduction">https://ttlc.intui...>
FAQ: Are items I purchased for my classroom tax deductible?
<a rel="nofollow" target="_blank" href="
https://ttlc.intuit.com/questions/1900580-are-items-i-purchased-for-my-classroom-tax-deductible">htt...>