Help -> Catalyst

Hi, I need help with the theme catalyst . I would like to make the asthma medication one against bronchitis . that I need a catalyst . How should I know what I take when I have to choose 2 ?

Thank you Tobias

Hi Tobiw83, sorry it’s difficult for me to understand exactly what issue you are having. Does this Youtube video help?

youtu.be/835AJS60lJ4?list=PLdrq … 5URDVtPKYM