1. You only have one post.
2. When you log on to the forum your user name is displayed at the top left along with other information. One piece of information is 'Show new replies to your posts.' clicking that would show a list of all topics that you either created or posted in that have new replies.
You can also click the Profile menu item (big orange bar at the top of pages), here you can click the 'Show Posts' and that will display a list of your posts at the top of each is a link so you can go to that post. As far as I'm aware the default setting in the Profile settings is to email the forum member when a reply is received in your topic.
3. The captcha (word puzzles) are an anti-spam measure to combat bot spamming, they are only there for the first three posts.
4. There are several topics relating to the lack of avast voice, strange popup on auto virus definition updates. This is a known bug.
If you browse the forums you will see several topics relating to a known bug about updates.
1. no auto update notification popup (commonly displays an avast! tip - Ad, instead).
2. no audio voice over for the auto update.
3. the popup delay timings don't appear to work either.
5. Just right click on the avast tray icon and you will see Update, hover over that and you get two other selections - choose Engine and virus definitions. Or Click on the avast icon to open the avastUI, select Settings, select Update and chose Virus Definitions.