I’m filing single but don’t know how to remove my wife’s information

You cannot if you previously file joint - it almost impossible to remove all spouses information from a prior joint return.

Just start a new account with a new user ID and password with only your information.

Are you divorced?  If you were still married at the end of 2019 you can only file a Joint return or as MFS Married Filing Separate.

If you used Turbo Tax last year you should start a brand new account for yourself and not transfer from last year.  You can not remove a spouse or switch the order of names.

Online is only good for 1 return.  But you can use the same email address for 5 accounts.   How to start another return in the Online version  

https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-online/00/25596

Divorced FAQ

https://ttlc.intuit.com/community/family/help/what-if-i-was-divorced/00/25830

Start a new account. Removing a spouse is not recommended

https://ttlc.intuit.com/community/family/help/how-do-i-remove-a-former-spouse-from-my-return/00/27202

Getting Divorced article

https://turbotax.intuit.com/tax-tips/marriage/getting-divorced/L20NC66cf

Video tips for Divorced couples

https://turbotax.intuit.com/tax-tools/tax-tips/Family/Video--Tax-Tips-for-Divorced-Couples/INF14631.html

And see what AGI to use

https://ttlc.intuit.com/community/agi/help/what-agi-should-i-enter-if-i-m-recently-divorced-or-widowed/00/26954