Non-responsive customisation

Hello,

I’m a beginner with WordPress but I’ve never had any issues customising themes, however, when I try to customise this one after activating it, nothing happens and I’m stuck there.

For example, when I try to modify the following section:

Action Text Section Status*
Show Demo Hide

Action Text Section Content*
<h2 class=”text-center” style=”padding-bottom:25px;”>This is the action text area. You can edit it from the dashboard.</h2><p class=”text-center”>Your Button</p>
Navigation Menu ID*The frontpage section IDs (what shows up in the hover state and the address bar when clicked) have already been set to a default show in this field. If you would like to change the ID so that a different term comes up in the slug for that section (ie. https://mysite.com/#top instead of /#home), then change the term below for the corresponding section. You will also want to add the custom menu items in the Menus section of your dashboard (click “Links,” then add the entire URL, such as https://mysite.com/#top). IMPORTANT: You must also add this term to the title field in the menu editor. If you do not see this field you may have to activate it by selecting the Screen Options tab in the top right of the page and then checking the Title Attribute box.

I edit the content directly from the customisation column, on the left-hand side of the webpage, but nothing changes. Could anyone give me a hand on how to modify the sections, please? I would really appreciate it.

Many thanks,
Julia