Problem with uploading image to header

Hello!

I have a problem uploading a photo (logo) to my header using Blank slate theme. I’ve tried to insert <img src=”logotyp1.png” in different places in this codesnip. It hasn’t been working so far. I’m wondering if anyone can help me how to get the image there?
Right now it’s located insida the theme folder. (I’m working locally from my computer)

<header>

<div id="branding">
<div id="site-title"> <?php if ( is_singular() ) {} else {echo '<h1>';} ?>/" title="<?php bloginfo( 'name' ) ?>" rel="home"><?php bloginfo( 'name' ) ?><?php if ( is_singular() ) {} else {echo '</h1>';} ?></div>
<p id="site-description"><?php bloginfo( 'description' ) ?></p>

</div>

<nav>

</div>

</nav>
</header>

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