We all make mistakes, so don't worry about that
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If you look at the tabs at the top (under where it says Gransnet Forums) you will see 'Active Topics' and 'I'm on', amongst others. Active Topics will show you conversations still in progress, although it's not very accurate sometimes. When you've made a few posts, you can look at 'I'm On' to see if you have any replies.
There is an orange box on the top right labelled Inbox. If there is a little bell or something on it, it means you have a message - check it out
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Have fun - just post away and before you know it you'll have friends.