To access your Threads account, you can sign in using your Instagram account.
To log in to the Threads app, you can use your Instagram account in the Threads app. To expand image
If you're already signed into Instagram then click on Continue with Instagram at the bottom.
If you're not signed into Instagram, enter your Instagram username and password and click on Log in .
Now review information on your Threads app, then tap Confirm at the bottom.
Now select whether you want to have public or private profile, then click Continue.
Once you're logged in, you can import your Instagram profile picture, bio, and link.
How To Delete your Threads profile ?
Note: Deleting your Threads profile will remove your Threads account only and will not delete your Instagram account.
Click on profile or your profile picture in the bottom right to go to your profile.
Click on menu in the top right.
Click on accounts centre, then tap personal details.
Click on account ownership and control, then tap deactivation or deletion.
Click on Delete account, then select the reason and click on continue.
For Complaint
If your concern remains unresolved after contacting Threads support through the Help Center, you can escalate the issue to the officer details given below:
Designation: Grievance Officer
Email: fbgoindia [at] support [dot] facebook [dot] com