Access to my private Discord server (Patreon)

when renovating the Tiers, I found out Patreon supports Discord servers so i made one specifically for everyone here to chat together and have a live line of communication with me.

I just don't know how the people who have pledged before this feature was implemented can access the link which provides their teir specific Discord roles.  there may be a link or setting to obtain the discord server invite.

Here is a link to the FAQ about this feature:

https://patreon.zendesk.com/hc/en-us/articles/212052266-How-do-I-get-my-Discord-Rewards-