There are two options:
If you want to keep your Dish Cult account and only delete information related to Dish Cult Rewards:
Send us your request through our Contact Form on https://dishcult.com/contact
If you want to delete your Dish Cult account and all its information (including Dish Cult Rewards):-
If you are on the mobile app, please tap "My Account" at the bottom right of the app and select "Edit Profile".
If you are using the website version, on the top right you click on 'My Account' and select "Settingsā, Tap on "Delete my account" at the bottom of the page. Then again "Delete my account" to confirm Delete account (from Edit profile section in the app)