Report user (YouTube)

How to report user?
To report user, go to their channel and click 'about' section. Then, click the flag button and click 'report user'. But remember, read the most bottom words that say like "Flagged videos and users are reviewed by YouTube staff 24 hours a day, seven days a week to determine whether they violate Community Guideline. Accounts are penalised for Community Guidelines violations and serious or repeated violations can lead to account termination.". Which means if you false reporting their channels (for example like you want to report that he/she is spammer, cyberbullying, etc and then YouTube staff will check if he/she violates the rules. If not, you may get a community strike. If repeat about 3 times, your account will be closed down).

They have a few options to choose from (even report someone copied your videos as well). To report someone steal your videos will redirect to make a copyright notice to user. But also becareful that do not report the videos that have copyright by others or the music do not allow for copyright. Otherwise, you get your account be closed down.