What issues do you talk about? ESO Addon problems?
You can try the addon's given feedback methods which are shown in the addon's UI, written at the description, or at the addon's settings menu.
You can try to use ingame mail if you know the author's @displayName but most refuse to get the reports that way as the ingaem mailbox is often full!
So you need to be registered in the forum here and write a comment to the addon OR use the given addon bug report/feature request panels (if activated).
Read this please:
https://www.esoui.com/forums/showthread.php?t=9885
btw. addons ar eno professional software and they must rely on the ingame available possibilities so there is no direct way to conact or chat or voice authors. External access is blocked by the game for a lot of reasons.