Tagline

To see Tagline you need to use “Static Front Home Page”. Go to WordPress Dashboard -> Appearance -> Theme Options -> Home Page. Look at Homepage layout manager and move the Tagline to the top on the list. Also in WordPress Dashboard go to Settings -> Reading and make sure that Front page displays: Your latest posts.

Excellent, that was the answer I was looking for!
One more question regarding the Tagline though, is it possible to reduce the size of the block within which it appears, or to make it part of the main header?
Look forward to your answer.

You will not be able to insert Tagline into header, instead you can add banner, this is what needs to be done:

1. Edit file name header.php and find the entry starting with <nav id=”site-navigation” class=”main-navigation” role=”navigation”>

2. Insert the following piece of code just before the <nav id=”site-navigation” class=”main-navigation” role=”navigation”> entry:

<div id=”banner”>
<img src=”<?php echo get_template_directory_uri(); ?>/images/banner.jpg” alt=”banner”/>
</div>

3. Name banner file – “banner.jpg” and place it inside “images” folder in your theme directory, make sure that banner.jpg width=1024px or less.

Thanks for your helpful response. I don’t seem to find the “‘images’ folder in your theme directory” anywhere though?
Looking forward to your reply.

Use this plugin to upload banner file to “images” folder https://www.ads-software.com/plugins/wp-theme-file-uploader/