both the title and the description are background images.
two possibilities:
1.
if you are good with graphics, find these images in the /images folder of the theme ( logo.png and description.gif ) and 'photoshop' your own title and description onto them; then re-upload to the same location.
2.
or edit style.css of your theme, and find:
.logo h1 { width:334px; height:44px; font-size:2.1em; display:block; color:#fff; cursor:pointer; background:url(images/logo.png) no-repeat 0 0; overflow:hidden; text-indent:-1000em;}
.logo h1:hover { text-decoration:none;}
.description { width:227px; height:10px; background:url(images/description.gif) no-repeat 0 0; margin:-4px 0px 0px 9px; overflow:hidden; text-indent:-1000em;}
remove the background styles and the text-indent; so these styles look like:
.logo h1 { width:334px; height:44px; font-size:2.1em; display:block; color:#fff; cursor:pointer; overflow:hidden; }
.logo h1:hover { text-decoration:none;}
.description { width:227px; height:10px; margin:-4px 0px 0px 9px; overflow:hidden; }