Copy the files to wp-content/plugins/flash-tag-cloud
Activate the plugin - Go to the Plugins panel and you will see ¡®Flash Tag Cloud¡¯
Update Options - Go to the Flash Tag Cloud subpanel under Options panel. For most cases, you don¡¯t need to change any detail value. Click the ¡®Update Options¡¯ button.
Just write { flashtagcloud } without spaces on posts or pages where you wanna insert, then it will work.