Everyone does the challenge a little different but the constant is to coat your ends with Vaseline
Like me, i shampoo once a week so i put Vaseline on my ends every 3 days or so and put my hair into a bun. Once a week after i shampoo and blowdry, i coat my ends with vaseline and put it into a bun then apply more in another 3 days then just re-do the cycle. So if you shampoo every couple days or so you would adjust the challenge to fit whatever your schedule is for your hair