my home page keeps saying that it is out of date download latest version.after downloading the latest version the new stule home page does not appear==help!!

home start page does not have mozilla firefox logo it says google? and when l alter it next time l log in its back to google homepage. l am a silver surfer so l dont understand all the technical jargons, lam at a loss why l lost my home page in the first place and why lcannot get back to it never mind the latest version lol also l noted it has http at the beginning l thought it is suppose to read https=help, thanking you in anticipation janet watkins