attach pdf to order confirmation

I have just purchased the plugin to attach a pdf to the order confirmation.
I've installed it, but I don't see it in my plugins.
How do I access its options?
thank you

You can access its options via the joomla plugins manager. Make sure that you publish it.

I searched
hika pdf
and
hika email
in the joomla plugin section

what is the name of the plugin?

many thanks

It is called "Attach Invoice to the order confirmation e-mail"