Also, when you log in check the "bell" icon on the upper right if you are using a computer, laptop, or your cell phone in landscape mode to see if there any replies in the threads you have posted in or where your forum name has been mentioned ("tagged"). If there's a number in a small red box next to that icon, that means there's been some activity that you may want to check. Hover over (or tap) the icon and you'll get a dropdown box with links to the appropriate threads.
If your phone is in portrait mode, then the red box will be next to a very small representation of your avatar, if you have one. Tap that icon, then tap the bell for a list of your alerts.