one last thing, now that has all been changed the site title looks a little odd floating on the right hand side of the page.

I want to hide the categories, author and date information.

To hide the post meta information such as categories, author, and date in the Hatch theme, add this to your Appearance → Custom Design → CSS editor:

.entry-meta .entry-date,
.entry-meta .byline,
.entry-meta .cat-links {
	display: none;
}

I want previous post next post under the text body.

To move the previous/next navigation links to the bottom of the post in the link you mentioned, add this to the bottom of your Appearance → Custom Design → CSS editor:

.hentry {
	position: relative;
	padding-bottom: 98px;
}

#nav-below {
	position: absolute;
	bottom: 0;
}

Note that as a general rule you should only add CSS for changes you'd like to make to the theme without copying and pasting the entire stylesheet.

I want previous post next post under the text body and hide the categories, author and date information.

Any help would be appreciated.

Harry

Example of a post

http://harrykenneyherbert-blog.com/2012/10/23/instagram/