what is it, gemini? can't find where it says what it means..yet!

I have a question.. where's "subscribe to this thread" below each thread? look like we have lost our notifications.. I lost my notifications I replied to, about over 50. I can't repost in every thread and how I like to follow up some threads.. darn.

I just came back to this and see I've not gotten any noification from this! and few others I just responded to this morning.. (???)

help? thanks!