After you have successfully set up two-factor authentication, you are prompted for a one-time password every time you need to login to your JetBrains account.
First, enter your email address or username and regular password.
Then, you will be prompted to enter a one-time password.
Next, use the authenticator app you installed on your mobile device to generate the 6 digit one-time password needed to complete your login.
Alternatively you can use one of your recovery codes that you were prompted to save when you first enabled 2FA.
Upon entering the one-time password or recovery code, you will be successfully logged into your JetBrains Account.