Install new version
1. Create directory htmlbox in `/wp-content/plugins/ directory`
2. Upload files and directories from archive to the `/wp-content/plugins/htmlbox` directory
3. Set CHMOD 777 to directory `bg`
4. Activate the plugin through the 'Plugins' menu in WordPress
5. Configure plugin throught 'Settings' -> 'HTML Box'

Update from old versions
1. Deactivate plugin through the 'Plugins' menu in Wordpress
2. Upload files and directories from archive to the `/wp-content/plugins/htmlbox` directory
3. Set CHMOD 777 to directory `bg`
4. Activate plugin through the 'Plugins' menu in Wordpress