thezedt

You could try removing the
<script src="https://widgets.freestockcharts.com/js/jquery-1.3.1.min.js" type="text/javascript"></script>
line since jQuery is already loaded by the theme to see if that particular script is compatible with the latest jQuery version.

WordPress generates the thumbnails on upload. And it does not re-generate them if you change the settings. This is how WordPress functions.

1. If you use a logo, the logo always links to the homepage of the site.
If you don’t use a logo, you can make the whole header link to the homepage by setting the “Site Header” option to “Clickable header image”.

2. That is not part of the theme. You are using a plugin to generate that page. This is how a standard category page looks like in the theme.

The theme already has the logo margin(s) option to help you position the logo inside the header. You don’t need custom code for that.

Indeed “centering” it using the left margin is not responsive.

You used HTML comments <!-- ... --> to disable the author box.
But there are already some comments in the code, so your comment is broken up.
Try using PHP comments instead <?php /* ..... */ ?> to comment out the author box. Make sure you don’t break existing php opening (<?php) or closing (?>) tags

Which would the “regular” Welcome page be?

Changes done in the theme settings are effective immediately. Perhaps you are using a caching plugin and get a cached version of the page for a while.

You cannot use the built-in slider. That one is for the presentation page only.

But you can install a separate slider plugin and use that instead.

Are you using the built-in recent posts widget or a plugin-provided one?
How is your permalink setting configured?

Whatever plugin is loading scripts from freestockcharts.com is causing incompatibilities. If I block scripts from this external domain, the menu on your site works fine in my browser. Figure out and disable that plugin.

You’ll have issues again later. Your site is loading 2 jQuery versions:

<script type='text/javascript' src='https://capitalistwizard.com/wp-includes/js/jquery/jquery.js?ver=1.10.2'></script>
...
<script type='text/javascript' src='https://code.jquery.com/jquery.min.js?ver=3.7.1'></script>

You will need to figure out which plugin is adding the second call (loading the external version) as this will definitely break functionality when the two versions become out of sync (they are now, incidentally, the same version).

PS: We do offer premium support if you’re expecting support within 24 hours. Otherwise, support provided here and on our forums is done in our free time and may come sooner or later…

Were the incorrectly-sized images uploaded to WordPress before or after you made the 100×100 setting in the theme?

There is no other way. Child themes are the only correct way to make changes to a theme.

C16. What if I want more than 5 slides on the presentation page?

You can define up to 5 custom slides, but you can also set the slider to grab the slides from: latests X posts, X random posts, latest X sticky posts, latest X posts from category, random X posts from category, specific posts (by ID) – X is a configurable count.

To make slider compatible posts it is required to add a post title (which will be used as the slide title) and a post featured image (which will be used as the slide image). Make sure the featured images are of proper size (the same one as the slider is configured).

You mean the first title on the presentation page?

You can’t type HTML in there (like <br/>), but you can write a longer text to make it automatically jump on the second line then shrink its width via CSS to make the jump on the second line in the proper place of the text.

I see all images correctly at this moment.
Did you get this fixed?

1) leave the header background colour field empty in the theme settings.
Then define a header background image the color you want to use.

2) #site-title span a { font-size: 75px; }

3) You can make it appear centred by setting the site title left margin value in the Header Settings area (on the theme’s options page) to the appropriate value.