Installation - How do I install a theme
From Online Manual
To change the appearance of your forum, you can install a new theme. To obtain a new theme, follow the steps outlined below:
Note: if you install a theme AFTER having installed mods, those mods will not be installed properly in that theme (if the mod affected any of the template files used by that theme). Changes for mods will have to either be manually applied or the mod would need to be uninstalled and then reinstalled.
- Backup your database and files.
- Go to the SMF theme site. Choose a theme that is compatible with your version of SMF. Download the theme to your desktop computer.
- Go to the Themes and layout section of your SMF admin panel. At the bottom of the page you will see the "Install a New Theme" section. Click "Choose" to open a dialogue box.
- Within this box, find the theme you have just downloaded and click the "Install" button.
- An alert will pop up. Confirm that you want to install the theme.
- Your theme is installed.
If you want to make your new theme your forum default, go to "Themes and layout" and next to "Overall forum default:", select this theme's name.
Once you have completed this process, and you are happy with the appearance of your forum, remember to backup.
Alternative ways to install a new theme can be found here: Install a New Theme