Using sidebarTabs plugin within a page

I am using the plugin sidebarTabs and have figured it out fine as far as using it in the sidebar as a tabbed widget. No problem.

I also figured out how to make multiple instances. I get that.

What I can’t seem to do is make an in-page tab which displays a series of posts within the page. Just like the example on the plugin website https://www.blogviche.com.br/plugin-sidebartabs/
Here he has 3 tabs: Portuguese, English, and Screenshots,and when clicking on each, it displays a separate post/content within the page.

When I go to create a new tab, the only options I can choose from are widget items, or categories, etc. What I want each tab to display is an actual page; not a link to that page, but the page’s content.
eg. on my website (www.wjmouathawksfootball.com), I want the page “Rosters” to have a tabbed content similar to buddy’s “Portuguese, English, Screenshots” menu, that will show the different various I have on my site. So when you click on a tab, that particular roster shows up (not a link to the roster.) Do you follow?

In his sample page, it is just as I want, but I cannot for the life of me figure out how to design my actual widget code that will allow me to choose it for the new sidebar tab.

Anyone????