There are two possible solutions: CSS edit and File edit.
CSS edit(Not the best solution, but works)
.post-blocks .block-info span { display: none; }
It is not possible for us to write the file edit code since we don’t have access to your admin panel.
Install WhatTheFile plugin to find out the template that renders the code for the page and edit the <span> element inside .block-info. Make sure you are using Child theme before editing via both methods.