I'm not able to use my crayons!!

growyoungagain thought this was worth mentioning said
1

If you want to post something like say on fb or here and it has some personal info. that you don’t want to be public, how do you scratch over it. I’ve seen it done all the time. I’m using my LG II tablet that I bought from meh 2 yrs ago. In terms that a 4 year old would understand, how do I do it guys and gals.