Hi! I'm an almost 80-year-old woman who totally loves my computer and am trying to learn my android phone. I started using computers in 1980 and am pretty savvy but no expert, probably because things change so much so fast. I am particularly uncertain with my android. I have the user manual but am unable to find any answers in it to my questions. I can't find out how to set up a ringtone, figure out how to turn video on and off, and now I can't find any instructions on what to do when the calling icon is red and indicates that it's unusable. I have made calls in the past but suddenly it's dead! So I'm hoping to gain knowledge from all of you and maybe someday I will be able to help someone else. I don't know, for instance, what a tag is.