Everytime you post a comment, you have a choice in your Message Box to turn on or off email notification whenever someone responds to the topic you commented in.
When you receive the email notifcation, just click on the link in the email and it will take you to the topic.
The email notification also has an option to cancel any further notifications for the single topic you subscribed to, or to cancel to ALL notifications from ALL topics you participated in. Read the email carefully before deciding.
However, if you click on the topic link that was emailed to you and you find it is a dead link, then it was probaby moved, merged, or archived. In these cases, simply go to the SEARCH button at the top of any page and type in your assigned User Name to locate every topic where your User Name appears, which will include the potential topics that were either moved or merged. If no luck, then the topic may have been archived because of a members infraction of the Forum Rules.
ANOTHER OPTION:
Or, whenever you return the forums after an absence at
http://www.ipiu.org/forums/ , the very first thing you should do is look at the top of the main menu of all forums at
http://www.ipiu.org/forums/ , and to the right top you should see your User Name and a "Welcome back" title. Below the "Welcome Back" is the button link of
View Active Topics . Once you click on that, it brings up all the comments you missed since your last forum visit.