what should I install, be able to sell products on my forum?

The Commerce app.

Product mean files? Then Downloads app too. 🙂

10 minutes ago, Meddysong said:

The Commerce app.

where can i find it?

Client Area -> Your license -> Manage Your Community.

Edited April 6, 20205 yr by aXen | 1s2k

trade is off, how do I activate this plugin?

You must buy it.

Prices here;
https://invisioncommunity.com/buy/self-hosted/

But you must login to your client area
https://invisioncommunity.com/clientarea/purchases

Then you can buy the app which is $100 with a $35 renewal (per 6 months which is added on to your total renewal price)

how can i test this function please?

Request a demo: https://invisioncommunity.com/clientarea/demo