I think that TAGGING a thread means saving it for easy reference later? So how do I TAG a thread?  Thank you.

You can either hit the subscribe button and receive email notification if anyone posts there, or you simply post anything in a thread and (team members) can click on the "My Active Topics" button to see all of the topics they have posted in that have had a post in the last 72 hours. I have about 160 of those

ETA: When you see a post that just says "Tag", it means someone wanted to tag it to "My Active Topics" but had nothing to add to the conversation.