While they do have a promo code box, easyjet promo codes are very rare things.

In fact, I believe they might largely be a individual / single-use type of affair now. [They have been used in the past for seasonal offers, but this is rare and has not been the case in recent years, IIRC].

I'd be amazed if more than 0.000001% of easyjet customers had ever seen an easyjet promo code let alone used one.

So, what I'm basically saying is, unless someone here has been given one individually, that they are not planning to use themselves, you are not going to get one.