Plugins - How to

Hi - I would hate to think that I am stupid but maybe I am.

I have installed a whole bunch of plugins from the katalon store

Where are they - I cannot find them anywhere in settings or the side bar under plugins

so where do they install to ?
how do you access them ? so how do you use them?

and I have no idea where the reload plugins option is - I cannot seem to find it

please help?