How to convert a song off of YouTube onto my iTunes by just using my iphone?

I have an iPhone 5 - don't know if this makes any difference! And I'm trying to get a song onto my iTunes from YouTube but all the videos I've seen giving instructions are to do it on a apple computer and then into iTunes file! Is there any way that I can just do it on my phone onto iTunes on my phone?

With any smart phone - it doesn't make a difference. You can access the internet just like you can with a computer, the differences between the two wouldn't affect you. Go onto "Youtube", watch whatever song you want (don't use the youtube app… It wouldn't work otherwise), and using another tab, search "youtube converter", and pick whichever site you want. Copy the website link from the youtube video, and paste it into the converter. It will convert it into a sound file, and then you can download it. It should work from there.

The honest truth is, you can't. It doesn't work. There are ways to get songs off youtube into your music library on your apple device but, you guessed it, you'll need a pc

You must need a PC. And then use the enolsoft youtube to mp3 converter to free download and convert the youtube video songs to mp3. Then sync it to your iphone with itunes.