Custom Meta Tags??

How would I be able to add custom meta tags, lots more than just the typical section for keywords. Such as several like the ones below:

<META NAME="description" CONTENT="Online Shopping, Great Styles!
<META NAME="keywords" CONTENT="Men Women Children Accessories ecommerce, open source, shop, online shopping, nepton clothing, web store, nepton webstore, nepton web store, store, nepton shopping WECOME TO NEPTONS WEB STORE">
<META NAME="robot" CONTENT="index,follow">
<META NAME="revisit-after" CONTENT="15">

Thanks,
Nepton

you would apply them to the
includes/languages/english/YOUR TEMPLATE/meta_tags.php
oops I guess I needed to read more

you would put them in includes/templates/YOUR_TEMPLATE/common/html_header.php

Im pretty sure these are in place already though

And what is the exact way I would do that??

Well to be more exact... What would the code be to add stuff like in my first post, would it have to be in the same form as the keywords?

(ex)
// Custom Keywords

define('CUSTOM_KEYWORDS', 'ecommerce, open source, shop, online shopping, nepton clothing, web store, nepton webstore, nepton web store, store, nepton shopping');

Before you go messing with the HTML header- I would suggest you learn how Zen Cart does the Automatic Meta Tags or you could make some very big messes.