HELP !!

I'm going insane. I have no idea how this thing works. I had an account that I made like a year ago that I forgot about and it already had this cute pink layout, but I wanna change itttt. I'm too lazy to learn coding and I'm not sure how to use the layouts other people make. THIS IS SOO HARD I WOULD NOT HAVE SURVIVED WHEN THESE TYPE OF COOL WEBSITES WERE POPULAR BEFOREE AAA :c