I want to know how to activate search engine optimazation at any website.
Read google webmaster guidelines
There's tons of good articles here at Daniweb (do searches at the top right of any page) explaining different aspects of search engine optimization. You'll find out about things you can do to your web site to improve your rankings. They'll be things off site you can do to help boost your position in the search engine results pages. SEO isn't about one technique or thing you can do or one tag you can tweak. Sound SEO involves working several fronts.
Search engine optimization (SEO) is the process of touching the visibility of a website or a web page in a search engine's natural or un-paid (free) search results.
If you have never done seo on your site then do the onpage seo first on your site then offpage seo
SEO is a technique which helps search engines find and rank your site higher than the millions of other sites in response to a search query.
For activating your site you have to follow the seo stratergy for your website.You have to follow the techniques of seo such as Onpage and offpage.
Active? Is you site in WP? if yes that you mean to say how you install SEO plugin? if not and you want to do SEO for your site then you must start learning from on-page seo then you can go with off page which is easy.
Search Engine Optimization is the process of increasing the amount of visitors to your website by obtaining a high-ranking position on a search engine.