URL's incorrect and the search feature on my site does not work

I have 2 issues with my website. 

1. The template I am using has a search option to search for anything on my site. When I type in something that I know that is on my website and click search, it comes up and says error and that's all it says. I have found no way to correct that or remove the search feature.

2. When a vistitor goes to our website, when they click on something else, the URL says my name.comcastbiz.net. Since I pay for the business package, shouldn't the URL say (example comcast.com/lostpets) instead of the comcastbiz.net?

If a ComCast Business expert could contact me, that would be great.

Thank you very much!