Shantz WP Prefix Suffix is a light plugin to quickly add text/htm/css before and/or after your posts and/or pages.
The shantz-wp-prefix-suffix plugin can be installed in following easy steps:
Unzip "shantz-wp-prefix-suffix" archive and put all files into your "plugins" folder (/wp-content/plugins/). It is advisable to create a sub directory into the plugins folder, like /wp-content/plugins/shantz-wp-prefix-suffix/
Activate the plugin
Go to Settings > Shantz WP Prefix Suffix, adjust your settings and save them.