I guess it is confusing when an 'expression/term' is used without explanation. There is no subscription cost.
In regard to this forum (and others I think) you can "subscribe" to a topic. If you check the very bottom of a thread you will see the word "subscribe" - which is clickable.
When you click this it 'advises' the forum that you wish to see new replies/posts on that thread .. and you will receive an automatically generated email advice that a reply or addition has been made to the post.
Additionally, when you create a post, there is a 'radio button' you can click to "email me when a reply is posted" .. this too generates an automated email notification should a reply or addition be made to the thread.
It is this 'automated email notification' that is not occurring to at least some of us.
Hope that is simple to understand ....
Cheers - JOhn
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2006 Discovery 3 TDV6 SE Auto - 2008 23ft Golden Eagle Hunter Some people feel the rain - the others just get wet - Bob Dylan