To delete one of your contacts in your TronWallet app, first tap on the icon on the bottom right of your navigation tab bar and then tap on Address Book. There you will find two tabs: Contacts and Accounts. Tap on the Contacts Tab and if it is already active and you will see a list of all your contacts in TronWallet. Tap on any of those contacts to bring up a modal with four options: Send, Transaction, Edit and Delete. Tap on Delete and you will be asked if you are certain you would like to delete that contact. Tap OK to delete it and it will be removed from your Contacts List.
Help & Tutorials: https://medium.com/tronwallet-support