OT Virtuemart category module

[julianroger]

joomla 3.8.5
virtuemart 3.0.18

Good Day
I have Categories and child categories

ON one of my Joomla pages I have a module:
OT Virtuemart category linked to my main categories
When I click on a main category through this module, a secondary page opens
I would like to add the same module (OT Virtuemart category) to this page, but to have it display the subcategories
I think I might have to add the coding to the child category description editor. I see there are functions to add a module, but it does not work

Please assist

[jenkinhill]

Your VirtueMart version is old and insecure - see http://forum.virtuemart.net/index.php?topic=118683.0

You should be using at least VM version 3.2.2 with Joomla versions greater than J3.7