All pins that I have down loaded

I need help in deleting alot of my pins because I have doubles and triple ones as well some that I didn't download plus I have more than one broad the one I have downloaded was the kawaii animals please help me also I had to delete your apps several times because I was having problems with my phone and your apps kept on telling me you were not safe please protect my privacy as I do you I do things to my daughter and grandkids because I know that they would like them we for ourselves please reply back thank you don't understand what do you mean category also how do I become a member is it free I mean is your Pinterest app free