Originally Posted by pornguy

Google search HTML Meta Tags and do some reading. There is NO 1 true way. Try what you think will work best for you, Give it some time, 90 days at least and then make a change if you think you need to.

Originally Posted by jaromir

Meta keywords ISN'T important!

Important are (sorted by priority):
1) text's on page (H1, keywords in text...)
2) backlinks
3) keywords in URL + title
4) META description

META KEYWORDs was important in 1996, when search engines don't indexed whole pages, don't looked for keywords in pages and only looked in the META KEYWORDs. Sure, I'm using META KEYWORDs too, but it isn't important, if you will not use it nothing will happened. Focus to points 1-4.

And answer to the your question is:
<META NAME="keywords" CONTENT="kyword1, kyword2, ...">

W3C defined it:

http://www.w3.org/TR/REC-html40/struct/global.html

<META name="keywords" lang="en-us"
content="vacation, Greece, sunshine">