Install Pattern Wrangler
Pattern Wrangler is a free plugin: Please visit the plugin on the WordPress Plugin Directory
Log into your WordPress admin (i.e., your dashboard)
Go to Plugins->Add New
Type in "Pattern Wrangler"
Install and Activate the plugin
After activation, you can find the plugin's settings in the Dashboard under Patterns->Settings.
Download the plugin zip file from the WordPress Plugin Directory
Unzip the plugin zip in a place you can remember for the next steps
Log into your FTP program of choice for your website
Upload the unzipped folder into wp-content/plugins
Log into your admin dashboard
Head to the plugins screen
Search for Pattern Wrangler.
Activate the plugin
After activation, you can find the settings screen under Patterns->Settings.