Hi Henry-
Glad you like the template! I don't know exactly where you'd need to make the changes but they are in the .css of the template code.
Look for this section which controls the text of the posts. You'll then need to add color:#000000; which will make it black. You can change it to any other color as well. You'd just need the correct color code.
.entry p {
text-align:justify;
}
For the post titles, I believe you need to edit this part and change the color to #000000; to make it black.
.entry2 {
color:#666666;
float:left;
margin:5px auto;
padding:5px 6px 10px;
text-align:justify;
width:500px;
}
Hope that helps.
David