When issued a go around, is it normal (considering that I've the option to reply myself) not to have the Acknowledge option in the menu? I've been told to go around a number of times and the only option I;ve in the menu is Missed Approach. The correct response should be to advise tower and begin the go around, not to declare a missed approach right? Why I can not Acknowledge the Tower request?

as soon as you get the go around, start climbing, clean up the plane. as soon as tower sees a positive rate of climb, he will tell you to contact departure