This is something you can do regardless of your theme. Look in the WordPress.org/plugins repository and type in “social” – you’ll find bunches of plugins that can achieve this.
Different ones place the buttons in different places, so read the descriptions to find one that does what you want. It may take a little trial and error to get one that looks right for you and does what you want, but there are tons to choose from. You should be able to achieve this without too many problems.