Find some social media icons that you like. A simple Google image search for "social media icon png" will bring up a ton of options. Download the ones you decide to use. For my site, I am using a set called "Minimalist" that was designed by Zee Que at designbolts.com. You can get them here for free.
If you have your own website upload your images to your Public_HTML folder. This will allow you to access the icon at www.YOUR_WEBSITE.com/IMAGE_NAME.png. Obviously, you need to change YOUR_WEBSITE to the name of your site and IMAGE_NAME to the name of the image (likely something like Twitter.png or Pinterest.png).
If you do not have your own site to upload the images you can upload them to a place like Flickr where you can get a link the the specific icon image.
Give this gadget a title if desired. Then you will have to type in a modification of the code given below. You will need to add the text highlighted in gray between <a and </a> into the content box. The first example is for Facebook. In the text below, where it says YOUR_USERNAME you will need to change to text to reflect your Facebook name. You will also have to change/modify the link to access your icon image; replacing YOUR_WEBSITE with the name of the site where the image is stored and ICON_NAME to the exact name of the icon.
<img width="60/" title="Follow YOUR_USERNAME on Facebook" alt="Follow YOUR_USERNAME on Facebook" src="http://www.YOUR_WEBSITE.com/ICON_NAME.png"/>
Here are the examples for Twitter and Pinterest for my site. Now following the directions above, just change where I have Ladybug Soapworks and my website and image name to the appropriate names for your site.
<img width="60/" title="Follow Ladybug Soapworks on Twitter" alt="Follow Ladybug Soapworks on Twitter" src="http://www.ladybugsoapworks.net/Twitter2.png" />
<img width="60/" title="Follow Ladybug Soapworks Pinterest" alt="Follow Ladybug Soapworks Pinterest" src="http://www.ladybugsoapworks.net/Pinterest.png"/>
I hope this tutorial will help you to get your blog looking a little more professional, too!