Plaese Help

I've been trying for some time to understand what you mean in your manual.
What do you mean by Custom Field Section?
I have only one product type list. There is nowhere where the possibility to choose plug-ins.
Please help me.

Hello
Virtuemart 2 is required to use this plugin.
Install the plugin like a regular joomla plugin. Enable it
then go to virtuemart products, custom fields section.
Create a new custom field and select the plugin.
Then in your product settings, custom fields tab you will be able to select the custom field created before and it will show on the product details page.