It's easy.
First, create your YouTube account.
Then, find the video that you want to comment on.
Right click on the video and click on "Add a comment."
Type in your comments, and then click on "Post comment."
The comment is posted immediately.
It is not possible to post a comment on YouTube without an account. Posting comments on Youtube is a prvilege you get with having a YouTube account as this also attempts to deter potential mass spammers and cyberbullies.
You need a youTube channel to post a comment. This is because YouTube needs to be able to display some name that is linked to your account.
You might not be logged in
On a video you just go to where it says "Post comment" under the video you want to comment on and for a YouTube channel, it's the same thing but some people disable their comments on their profile AND videos and that means you can't comment.
If you try to post a comment on YouTube, it might say, "error, try again". If that does happen its because you spelled something wrong.
i really have no idea you think by now someone would have answered it
Try signing out then signing back in again that worked for me
No. if you see a bad comment please delete it!
from my calculation's yes it is as long as you don't violate i only use mine to post comment's
Under any (new) Smosh Pit Weekly on either Smosh.com or on YouTube
You need to have a YouTube account linked to your Google+ account to comment and let others reply to that comment, so yes you need to have an account (be a member).