Vegas X does not require you to insert a promo code when you claim the sign up bonus. In this case, you need to contact the customer support.
Then again, as the site is not the most credible, you might not have it. After the long registration process, you should have the $20 in free coins in your account. Then, after fetching those, you need to register at. First, you need to head to to fetch an username and password (more details below). Claiming the Vegas X sign up offer is not a straightforward process.
