Update: For this post you will need to know how to open the template editor and this post How to backup and edit template will show you how.
A blog reader said he couldn't find a post for post description, and since it may involve a long reply, and it will benefit more if I answer in a post, I will write about it here.
You can write meta tags on your own, but there are plenty of meta tag generators on the web and one of them is META Tag Builder. If you go to that site, all you need to do is to fill in the title of your blog, a description, keywords, email address, author, (leave the EXPIRES field blank), use the drop-down menu to select the language of your blog, then if you don't want search engine to spider your blog and/or the links to be followed, tick the box for NOFOLLOW, NOINDEX (I left this blank as I want my blog to be crawled by search engines and for the links in it to be followed), then just click the CREATE HTML button and the meta tags will be generated for you. Most of the above is optional and you can leave them out if you want.
Just a note. If I remember correctly, XHTML tags have to be in lower case alphabets. See the last sentence at Common HTML Validation Problems. Also, HTML tags normally comes in pairs, opening and closing tags. A few tags like the HTML for displaying images <img> and <meta> doesn't need a closing tag. Only thing is, with XHTML, I think you have to write your tag as <meta />. The meta tag generator gave this for my meta tags (it also include <HEAD>, etc. You can leave this out as it is already in your template. Just make sure to paste the meta tags below the <head> tag in your template:
I changed it to