Pete , there are a few ways to make your life easier.
From the main page (http://lotuscortina.7.forumer.com/index.php) if you look down the new categories each one has what looks like an 'e' at the beginning of it.
If this is blue and static it means nothing new has been posted in that topic. If it is orange (and spining I think) something new has been posted. This way its easy for you to identify which topic you need to check.
Also another (and probably better way) is from the main page , if you look at the top right hand side you will see 'View posts since last visit', 'View your posts' , 'View unanswered posts' - Click on which one you fancy seeing the results of.
I'm still finding new tools and functions every day - but I'm sure once you have got used to it you will never look back.