the seo process of yahoo should be the same as Google, bing, and ask.com
if you are building a website or blog you should consider generating a sitemap.xml for example on the website i built:
make good use of the html title tag, meta tag content description/key words, and h1 heading tags.
another useful thing is micro-data embedded in the HTML using schema.org
check out google.com/webmasters or bing.com/webmasters.
bing is tied to yahoo now