Page navigation at the top of the page or post

Currently the page navigation with previous and next posts are shown at the bottom of the post or page.

I need some help in placing the navigation links to the top of the page instead of the bottom.

Also, instead of navigation link to the previous post, the link should point to the Home page.

Can you help me in doing that?

http://www.chelmsfordsaicenter.org.

I have enabled the access.