I don't understand what do u mean by activate SEO
DO u mean how to start to do it??
Here are some tips that will help you to do this:
1. Use Keywords/phrases that best describe the target page.
2. Avoid using image maps, if needed make sure to add text links at the bottom of all pages.
3. Do not use long text; limit 40-50 characters in a text link
4. Avoid using JavaScript links
5. Create text links and use a common navigational menu for all pages
6. For best results try to limit the number of links per page to 20. (Only a recommendation)
7. Include a site map if you have more than 20 pages.
8. If you are using flash navigation, always have text links as a supplement to the flash
9. Try to use keyword phrases in the HTML and image file names
10. Keep your file names hyphenated.