update for my iPhone 6s

first of all, don't think this was a good update for this phone so should have been forwarned. meanwhile, bluetooth now has someone else's IMac on my blue tooth which i have not idea who that is and cannot delete it. when i go to privacy on iPhone it take me out of my wifi.

what a bogus update for this phone. apple, you should have warned those of us who cannot afford to spend more $$ on a new phone (mine is only one year old) to let us know that the new OS is way too much for this phone i would be ok with that. now my phone is a MESS