Here are all 25 episodes. If you look to the bottom-right of the video, you'll see the words Report Broken Video 7533, and below that you'll see a link to Itazura na Kiss Episode 2. Or scroll down and you'll see links to all 25 episodes.
It's best to watch Anime in Japanese with English subtitles. The Japanese actors are far better.
Shojo (Anime for girls) are most often full of Romance (similar to old-fashioned British "sweet romance"), but a good many are also of the "slice of life" variety, which are compelling stories about people's lives. The Anime Nana is one of the very best of those.
*Be sure to change the capital "H" to a small "h" if it appears that way in the http.
http://www.anime1.com/watch/itazura-na-kiss/episode-1