jeremy needs help

okay so very recently i grew my hair out some more and i colored it blond and now it's huge and i decided "hey i should put my hair in a man bun those are cute as hell i love those" and so yeah every day when i got to school i would have my girlfriend put it in a bun because idk how to tie my hair up with a hair tie but now we get out of school for summer vacation on friday and she won't be here to do it for me so i really badly need to know how to tie a hair tie so i can keep it up

long story short i just need to know how to tie my hair so if anyone could explain or link me to a video or something that'd be great thanks

https://www.youtube.com/watch?v=3P73C4Oea14

thanks so much, i got it!