Promo code localfavorite is good for $10 off your next Uber ride taken by May 1.
In the Uber app go to Payment and scroll down to ‘Add Promo/Gift Code’. I had no problem adding it to my account. This certainly won’t last.
In the past I’ve seen offers like this that are really intended for a specific Uber service or in a specific city even though the offer doesn’t appear to say that — so it’s possible that ‘your mileage may vary’.