How To Replace Newer, Older and Home Link In Blogger?

For doing so follow the steps below,

1. Go To Blogger > Layout > Edit HTML
2. Check the Expand Widget Templates box at top-right-corner
3. Search for this,

<data:newerPageTitle/>

And replace it with this code,

<img src="URL-OF-PREVIOUS-BUTTON"/>

Now search for this,

<data:olderPageTitle/>

And replace it with this,

<img src="URL-OF-NEXT-BUTTON"/>

Then search for this,

<data:homeMsg/>

The above code will appear twice and replace both appearances with this code,

<img src="URL-OF-HOME-BUTTON"/>

Make sure to replace the URLs with the Image Links of your uploaded Images.
 
4.     Finally save your template and enjoy the new look!