Step 1: On the left-hand sidebar, you will see the WordPress section menu. Hover over Appearance, and then click Themes.
Step 2: Here you will see a catalog of theme options. If you want a theme preview, scroll over the theme image and click Theme Details. Or, if you want to see what the theme would look like with your own page, click the blue Live Preview button.
Step 3: In the Live Preview option, you can play around with the theme options. Some themes offer more customization, while others offer very few. Keep this in mind when choosing a theme.
Step 4: If you want to use a theme, click the Save & Activate button at the top of the page. Your new theme will be live.
More options: If you are unhappy with the theme options saved in your Themes menu, you can new ones by clicking Add New Theme in the lower right hand corner. From here, there are a wide variety of options to choose from. The feature filter at the top of the screen can help you find a theme that best fits your blogging purposes.
Step 5: If one grabs your eye, download it. It will then appear on your original Themes menu, and you can decide from there if you want to activate it. **Downloading a theme DOES NOT make it apply automatically to your page. In order to make a theme live, follow steps 1-4.