Here is how to go about it.
1. Place a link to www.temi.co.uk on your blogroll (this is a joke
1a. You need to download the plugin from its source, upload it to you word press site , when you access your word press site via ftp you will see many folder, look for one called : wp-contents , expand that folder and you will see other folder including one called plugins , upload the plugins you have downloaded to that folder.
2. Now login to you word press admin panel, click on plugin tab to open the plugin management (see attached image).
All you need to do now is click the activate button and you plugin should be working.