Header

I am sorry but this is starting to feel like custom web design work. I can only help you with bugs or minor tweaks. You can find the help you need on http://jobs.wordpress.net/.

As for your question, I am going to help you one last time.

Open header.php find:

<h2 class="description"><?php bloginfo( 'description' ); ?></h2>

add above it this code:

<br />

Now open style.css find:

.logo {
display: inline-block !important;
position: absolute;
font-size: 36px;
letter-spacing: 10px;
font-weight: normal;
text-transform: uppercase;
text-align: left;
top: 50%;
left: 50%;
margin-left: -245px;
transform: translate(0, -50%);

change it to:

.logo {
display: inline-block !important;
position: absolute;
font-size: 36px;
letter-spacing: 10px;
font-weight: normal;
text-transform: uppercase;
text-align: left;
top: 50%;
left: 50%;
margin-left: -245px;
transform: translate(0, -50%);
text-align: center;
}

also find:

.logo a, .logo .description {
display: inline-block;
float: left;
}

change it to:

.logo a, .logo .description {
display: inline-block;
}

Sorry for being harsh, but its just a free WordPress theme.