profile keeps breaking when i paste code

whenever i add new code to my profile it either doesnt work or breaks the entire profile. i wanna add a tv effect, youtube autoplay, and floating images, but when i add the code, depending on where i put it, it either doesnt work or breaks my profile. help?? ive been trying for maybe 3 days now and i genuinely cant figure whats wrong. i dont wanna change my profile or restart, thats the thing.

gaaaaaaaaahhhhhhhhhhhhhhhhhhhhhhhhhhhh