Adding your site to a search engine

The easiest way for your site to be found by others is if a search engine can find it.
There are are three big ones that will cover up to 99,99% of all searches being made: Google, Yahoo and Bing.
So what you need to do is add your site to each search engine.
A word of warning here, don't use a site that says it will add your site to all search engines. This will most likely do more damage than good to your site.