Installing a theme is very easy in WordPress. Just follow the steps below:
1. Download the Theme
Considering the tips that we gave you above, download the theme files. Unzip the file and upload the theme in your following directory: /wp-content/themes/
2. Activate the Theme
Once you have uploaded the theme, all you have to do is activate the theme. You can do so by going to your wp-admin panel. Look at the sidebar on the left. Click on the tab Appearance > Themes. Find your theme there and click activate.
Once you have the theme activated you are ready to start setting up your Permalinks and start adding your content.