Well, first you will need internet. Since iphones have 3G connection you can get internet anywhere, so just go into the YouTube application and a few choices of wireless internet will come up. Some you will need a password, some won't. Once you get the password you are free to look around on youtube! With the iphone OS 3.0 software comes out you will even be able to have youtube accounts on your iphone and be able to have subscriptions on youtube also! (If you don't have the youtube application, update your iphone)
English translation:connect your phone to the internet then click on the app which has youtube written under it
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To save a YouTube video one needs to select a video then copy its URL and paste it to a URL text field that will save it on your computer. Keepvid is a site that will allow you to download a desired video and save it to your computer using the copy and paste method. Savevid is another site that will also save a video.
You can use a professional tool called NoteBurner YouTube Video Downloader to downloader YouTube videos in MPR or MKV format, then convert the downloaded video to your iphone.
The easiest way to download YouTube videos to your iPhone is to download and install the YouTube app on your phone.
You can try this videopower.me/tips/ct-download/download-video-to-ipad/
It can download videos from different websites like YouTube and can be transferred to iPad, iPhone, etc.