Meta Tag

[HarleyDavidson]

I am trying to verify my site on google- so that it is added to google's search engine.

They state i should copy and paste the meta tag into my sites Home Page?

1) Is it a advantage to do this?

2) Is it something you have to do, to show up on the search engine?

3) If i need to do it, How do i get to my sites Homepage & where do i paste the meta tag?

Basically whats the best way to get my site on the search engines.