Come check out my channel and please subscribe I will return the favour if you like!
Please feel free to leave a comment on some of my videos!
I'm guessing you're quite young / inexperienced so I'll go easy on you
Here's the thing, randomly subscribing to forums then asking people to subscribe to your channels is called spamming and you will get the link taken off. Most likely you'll be banned - people here are friendly so it's not happened this time, but that would be the norm.
The way you get people watching your videos is, quite simply, to make good and interesting videos. If you do that and direct a few of your friends to watch them, they might leave comments, like the video or even better direct their friends to do the same. Eventually if the video is good enough (or bad enough in the case of Rebecca Black) it'll spread like wildfire and the whole world will know about it before long. If it's just average or boring, then people won't bother spreading the word, it won't show up in search results as much and it won't be seen as much.
That's just the way it works I'm afraid! Spamming forums won't help, it just annoys people and the chances of anyone subscribing through it (through this or any other forum) are practically nil.