A lot of people like gambling. Even though it brings excitement, it has its dark sides as well. Problem gambling is a disease that destroys lives every day. As gambling are entering the digital domain, phenomenon such as E-sport has made it easier than ever to gamble. Therefore it is important to minimize the risk of gambling addiction among the users. At present time, as an attempt to make this possible, legislators have started to implement different rules on how companies need to deal with responsible gambling. A trend, that has become a problem, is that gamblers tend to not read warning messages that they get when they have been playing for a long period of time. This thesis is about producing recommendations for how to design these modal windows so that users actually take the time to read the information they receive. The methods used in this thesis are connected to the 6 phases of the design thinking process produced by Nielsen Norman Group and they were literature studies, interviews, prototyping and user testing. It was found that people with a previous gambling addiction wanted to see information about how much money they had spent in total on their account. That could also show more clearly how serious one's playing habits are. One cannot stop everyone from developing a gambling addiction, but one can give everyone a chance to become healthy.