How to use MediaWiki extension BreadCrumbs2

Question

I created a MediaWiki based wiki. An important feature asked over and over by users is Breadcrumbs.

"A 'breadcrumb' (or 'breadcrumb trail') is a type of secondary navigation scheme that reveals the user’s location in a website or Web application" (source: smashingmagazine.com).

So I added extension BreadCrumbs2 which has recently been updated and is stable.

Now I am in the implementation phase, however I don't seem to be able to grasp the way it works. Here is what I've done so far...

I have a Main_Page that contains 4 sections:

• Institutional Wikis
  • Institutional Wiki Test 1
  • Institutional Wiki Test 2
  • Institutional Wiki Test 3
  • Institutional Wiki Test 4
• Manuals
  • Manual Wiki 1
  • Manual Wiki 2
• Translations
  • Translation 1
  • Translation 2
• Other
  • Other 1
  • Other 2
• etc.

When one clicks on the Section name (say Institutional Wikis), one would land on a page where he/she sees the following:

• Institutional Wiki Test 1
• Institutional Wiki Test 2
• Institutional Wiki Test 3
• Institutional Wiki Test 4

Same pattern for other sections (Manuals, Translations, Other, etc.). I then proceeded to created the MediaWiki:Breadcrumbs page where I added the following source (but I'm not even sure it is correct):

* ICRCpedia @ [[Main Page|Home]] > [[Institutional Wikis]]
* ICRCpedia @ [[Main Page|Home]] > [[Manuals]]
* ICRCpedia @ [[Main Page|Home]] > [[Translations]]
* ICRCpedia @ [[Main Page|Home]] > [[Other]]

What I don't understand is the code I have to add at the beginning of each page (honestly, I thought everything would be automatic in the sense that people start at any page, then when clicking a link that leads inside the wiki the previous page would appear in a horizontal list and so on).

Can anyone help with what I wrote?

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Technical details:

• MediaWiki 1.34.0-alpha (95b9bef)
• PHP 7.2.18 (apache2handler)
• MySQL 5.6.43-log
• BreadCrumbs2 2.1.0 (6ab3075) 2019-06-08T00:12:33