Add url to yahoo search engine by pursuing below guidelines, it would be better if you can submit your website to as much as search engines as you can. Most of the time website is automatically indexed in all search engines but sometimes your website design, content and setup of your blog will not able to index links properly So if you do this manually then it will be best for your website.
Read: Add URL to Bing
Where to Add URL to Yahoo?
1. Go to Yahoo URL Submitter
2. Click on “Submit Your Site for Free”
3. You will be redirected to Bing. Follow the on-screen instructions for submitting your URL.
This would be only method to add URL to yahoo, i want to clear that you should not use Auto Submission Ways because it will be marked as spam by many search engines So you can try to Add Website to Google Search Engine and Google Webmaster tools to access more then enough functions.