Changing next/previous blog from blog titles

Hi, I was just wondering how I change the 'next/previous' function in the theme so it doesn't display the name of the titles of the blog but instead just simply next/previous or newer/older?

Also I was curious if it was possible to change the little animated 'home' icon from the icon to the word 'home'.

ALSO (sorry about this) if I could change the search bar so that the magnifying glass was clickable for searches and also display inside the search bar the word 'search'.

I think I may be going overboard on usability.

Thanks for any help in advance. I absolutely love this theme and it's been interesting for me to learn bits and bobs of editing templates. Something that is happening quite slowly.