Exclusive gateways

I am very beginner to Flowable. I have a requirement to execute two user task in exclusive and then join their results. So I am using a exclusive gateway to I want to fork two user tasks and want to execute condition base.
suppose I have two user task “card present” and another "Card not present " . I have a presentForm have mention two check box card present and another card not present.
if i checked card persent then flow order is card prsent execute.