RobbieB1953 on "Adding Tweet Button"

I'd like to add the Twitter icon at the bottom of my posts. Is this correct?

<a href=”http://twitter.com/share?text=<?php the_title(); ?> -&url=<?php the_permalink() ?>” alt=”Tweet This Post” title=”Tweet This Post” target=”_blank”>Twitter</a>

And if so, where do I put it (I'm using a child theme)?