That is one of the "unfortunate" side-effects of being an active user :) Thanks for participating and be well!
I had previously clicked on "add to watch list" but I was getting so many emails every day that my mailbox filled up so I disabled that every day emails. When a user makes so many posts in a day it really creates a problem using this function and getting so many emails. But I guess this is my only solution. Thank you.
When you find a thread that interests you, you can click "add to watch list", which is right below the "post a comment" box on every thread.
On your home page, click "account settings." That is where you can elect to receive email notifications of changes to your watch list, and the frequency of those notifications.