Try this
1. Go to
twitter.com/about/resources/tweetbutton
2. Customize the Tweet Button – choose the shape and size of the button, create pre-populated text for the message, and confirm which Twitter accounts you'd like to suggest to users. The main account will become an @mention in the Tweet. (By default, we'll use the account to which you're logged in.)
3. Paste the code into the html of your website wherever you would like the button to appear.
4. Done!
Hope it will be beneficial for you.If you want further help visit -
www.talentsfromindia.com/joomla-cms-
developer.html