1. Login to your WordPress admin dashboard.
2. Under the dashboard menu, hover your mouse on "Appearance"¯ and then click on "Themes".

3. Click on "Add New"¯.

4. In Add themes page, you can search for a theme or browse the themes from "Featured"¯, "Popular"¯, "Latest"¯ options. If you hover your mouse over any themes, you will be presented with two options - "Activate"¯ and "Live Preview"¯.
5. Hover your mouse on any theme you like and then click on "Install"¯.

6. A newly installed theme will show you the "Activate"¯ option. Click it!

Congratulations, you have installed and activated a new theme on your blog.