I am pretty sure that feature is built into xenforo, if you click "options" and then "user registration" you can select to start a conversation with new members i believe. ive never used this feature myself, instead i have a notice set to appear only to registered users or users of a specific group
hope this helps
XenForo Requests
Registration Message
Submitted by Rem, 22-05-2016, 08:17 PM, Thread ID: 21296
Thread Closed
RE: Registration Message 01-10-2017, 07:12 AM #11
01-10-2017, 07:12 AM
#11 RE: Registration Message 21-11-2017, 10:54 PM #12
21-11-2017, 10:54 PM
#12 RE: Registration Message 21-03-2018, 05:36 PM This post was last modified: 21-03-2018, 05:37 PM by Elite_Modz #13
21-03-2018, 05:36 PM
#13 This post was last modified: 21-03-2018, 05:37 PM by Elite_Modz
RE: Registration Message 10-03-2020, 02:47 PM #14
10-03-2020, 02:47 PM
#14