Homepage Introduction block appear just below the slider on homepage. This region acts as a Drupal block region. You can create this block from:
Administration >> Structure >> Blocks
example.com/admin/structure/block
Step 1:
Navigate to: Administration >> Structure >> Blocks and click Add block
Step 2:
Create a new block with some content. You may use below sample content.
<div class="center">
<h1>Welcome To LavaPro</h1>
We design beautiful high quality Drupal themes
</div>
And set location of this block to Homepage content with dark background region and click Save blocks.
Done!!
Important
When creating block, make sure you select Full HTML as Text format.