Hi Kewee,
My first advice would be to get the developer who installed the website to install "SH 404 SEF" plugin. It can be a bit complex initially and you will need to pay for it the first time around but paying for it is the only way to get proper support. I never use the built-in meta data functions on Joomla anymore because I never got results. (I did manage to 'break' one or two sites while coming up to speed with the SEF plugin LOL) Here are some of my client sites that have picked up in organic rankings since optimising using the plugins: www.snazzybags.co.uk; www.pownallandhampson.com; Voice Activated Media Center Remote Control by Amulet Devices. Hope this helps.