How does this work?

Hi dsl25,

On screenshots you've already seen that ACP is not a simple 1|2|3|4 pagination plugin. Its pagination buttons contains subPage titles. So the pop-up asks you to insert button title. The first two button types are available in free version:

These are the demo of free version button types (three types):

http://gvectors.net/demo/acp-pro-pagination-button-layout-4/
http://gvectors.net/demo/acp-pro-pagination-button-layout-5/
http://gvectors.net/demo/acp-pro-pagination-button-layout-6/

It's very simple to use, just select subPage content in post content and click on ACP black button, then insert button title. You can manage button lyouts (types) on Post Edit page or in Dashboard > Setting > ACP Settings.

Video tutorial:

Sorry but I really don't understand anything in there.

I checked the videos but there is nothing relevant in there, did the settings for having "Layout #1 – Next / Previous" but still can't get any results. This button title doesn't make any sense: what title? title of what? I just need "Layout #1 – Next / Previous"... there is no title in there!

I managed to get those buttons somehow but the whole page is still loading below the buttons.

You can choose Next/Prev button layout in Dashboard > Settings > AC Pagination page or on Edit post screen.

You can add dot or something else in pop-up title field or you can even don't use the button. You just need to add plugin [nextpage] shortcode around subPage content:

[nextpage]
.... page 1 content ...
[nextpage/][nextpage]
.... page 2 content....
[nextpage/]