CF Missions Help plz

Hi Guys, Today i finally got to my 5th mission on my new account. But im not sure how to get the 50% xp. People told me to click it (I clicked it) People Told me to Go to my z8games Mall and activate it (I tried) People also told me to check my storage (Fail). Could someone please tell me how? I need it badly to rank up so i can get my clan logo.

P.S: Pm me if you would like to join my clan

Do you mean the reward, you get after, you have completed 5 missions?