I need to show something only to users with active subscriptions, im using the edd recurring payments plugin, I found this is their docs
$subscriber->has_active_subscription()
But im not sure how to make use of it to show something only to users with active subscriptions.
So i will be adding this code in my archive.php file and show extra php code for active users.
that code you found is part of the OOP class used by Easy Digital Downloads. Their docs are here: https://docs.easydigitaldownloads.com/article/1160-recurring-payments-developer-eddrecurringsubscriber
What you'd need to do is something like:
Watch out though, because that method will return true both if user has an active subscription and if he/she has a cancelled subscription (but false if subscription has expired). That may or may not be what you want.
I don't have EDD so haven't tested this but I hope it at least gets you started.