As your Abra wallet is held privately on your phone, you have no account hosted with us.
To delete the Abra wallet app from your iPhone, simply follow the instructions for "Deleting an app" described at the official Apple support page here:
To delete the Abra wallet app from your Android phone, follow the instructions on the Google Play support page here:
At this time, you cannot delete a currency wallet within the Abra app only the entire app itself. If you've deleted the Abra wallet app by accident you can recover your funds by using your recovery phrase.