All you have to do is click on the green flag and let the rest happen on its own.
https://www.google.com/search?safe=strict&rlz=1CASQGI_enUS814&biw=1517&bih=782&tbm=isch&sa=1&ei=RxhjXJ3sEoiHjwSW5L_wCw&q=fortnite+marshmello+stage&oq=fortnite+marshmello+stage&gs_l=img.3...5550.17339..17523...3.0..1.143.2349.23j6......2....1..gws-wiz-img.....0..0i67j0j0i10j0i8i30.qPrNDfvhqSI#imgrc=JO2EyjMOygxYJM: https://www.youtube.com/watch?v=jofNR_WkoCE
