The one way that I'm aware of is from the Home/Forum page click on any Sub Forum, on the far left there will be an envelope icon next to a given thread title, there will be an "arrow" on the envelope if you have a post(s) in that thread.
There may be an easier way, I'm sure Janet will advise.
2016 GM 2500HD 6.0L/4.10
2005 Jayco Eagle 278FBS
Reese HP Dual Cam
Putnam Class V