WordPress.org

WP QuickLaTeX is based on the free web service QuickLaTeX.com and doesn't require LaTeX to be installed on user's server or hosting account. Just install the plugin and you are good to go.

1. Download WP QuickLaTeX plug-in.
2. Unzip the plugin file and upload its content to wp-content/plugins folder of your blog.
3. Activate WP-QuickLaTeX through the 'Plugins' menu in WordPress.
4. Create ql-cache folder in wp-content and make it writable (by chmod 777 or through File Manager in cPanel).

WP-QuickLaTeX stores expression images in the folder wp-content/ql-cache, greatly boosting performance of your site.