Welcome to Android Central! Are you trying to share articles or contacts? It's not clear from your title and what you wrote in your post.
Most apps will have a Share option -- look for an icon shaped like 3 dots connected by an angled line. You will then get a number of ways to share (like with email, text, etc.). If you don't see the icon, then tap the Menu button and look for a Share option (which is how you typically do it on a browser).