Go to the Musixmatch desktop website and log in. You cannot delete your account through the smartphone apps.
- Navigate to your Profile page
- Click on the "Edit profile" option
- Click on "Delete My Account"
After this, you will be unable to log in anymore.
Every activity on your account will be deleted, including badges and rankings on the leaderboards. You will also lose your favorited and identified songs.
However, in case you wish you reactivate your account, you will be sent a link that will work for one week. Clicking that will allow you to recover your account. After the week, however, your account will be permanently deleted.
If you wish, you can create another account.