On the latest Android app, open the tab list with your own tabs, swipe left on the tab row, and tap the trash icon. If you do not see the trash icon, update Songsterr from Google Play first; the Android delete option is available in current versions.
On desktop web, open your tab on songsterr.com, click the “Edit” button at the bottom right, click the trash can icon next to the tab title, and confirm. You can only delete tabs you created. If someone else edited the tab and the delete button is missing, contact support with the tab link.