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I appreciate you for using QuickBooks, @g_gaska.
Connecting your TurboTax account to your new QuickBooks Self-Employed (QBSE) account is easy. You'll want to ensure to use the same login credentials you use in your TurboTax account when signing up for QBSE.
Here's an article you can read for more information about connecting your Turbotax to QBSE: Send your info to TurboTax if your QuickBooks Self-Employed account is different from your TurboTax ....
Also, I encourage checking this great article to learn how QBSE work: QuickBooks Self-Employed Overview.
Should you have other questions in the future, you can always post a reply anytime. Have a great day!