If this is your first experience with producing a website, there are a few simple things you need to know about how websites show up on the search engines, like Google.
First, do you have content on your pages? Content is the written part of your page which tells readers what your site is about. If you are writing about dogs, your content might talk about how to feed a dog. That produces a tag, "dog"; then you write the content to include "feed your dog with XXX dog food". Now you have the tags "dog", "feed dog", "food", "dog food". To add a tag that isn't there, you might enter "feed your dog", so when someone googles "dog food", your listing pops up. (Sometimes, when there's a lot of other listings for sites about dog food, your site might be WAAAAY back in Google's listings!)
Tags are those words or word phrases that you find to the right of your hub page. Those are taken straight out of the content you've written, and you need to have at least 10-15 of them. The more, the merrier.
Tags are the keywords someone types into a search engine when they look for something on the web, so if your content doesn't produce enough tags, the search engines have nothing to index to find your content.
Produce content to get tags; select tags to show up on Google.