Thanks for the response I'm not sure on how to do that is the problem if you have anywhere I could read about how to do that ddos I would greatly appreciate it.
It's super illegal to do in most countries to be honest as it disrupts internet traffic and often requires usage of hardware that the DDOS'er doesn't own. (botnets)
But if you're hell bent on wrecking their day and want to do some research into the technology behind pulling off such a thing
https://en.wikipedia.org/wiki/Mirai_(malware) is an ok place to start.
I do NOT condone you, nor anyone else DDOS'ing other peoples web servers as you could face jail time if caught... But I'm also not going to leave you high and dry when you nicely asked for more info.
Be safe, be smart. Good luck captain!