Just add start tags and one end tag into article text. The text inbetween the tags is going to be displayed in article a as tab.
Follow-up was quick and courteous, too.
That's is what I call Service with a capital S.
BTW, I have noticed that some Bootstrap-based templates (Zenith 3 from Themexpert, for one) break most tabs-in- content plugins, including this...but the problem lies in the templates, not in the plugin!
IMHO, if you are looking for a lightweight, easily configurable tabs-in-content plugin, look no further...
Thank you very much, always at your service:-)