@Elizabeth_Ham Welcome to the forum 
I’m Susurrus a moderator here at Spells8. I can’t see a specific reason why you wouldn’t be able to post in Introductions as you have very recently joined & created your account.
You may want to try a couple of things though:
→ Start the Interactive Forum Tutorial with Discobot!
→ Clear Your Cache
→ Log out of the forum then back into the forum… sometimes when you are logged into the site that doesn’t mean that you are logged into the forum, if that makes sense. They are 2 different sections of Spells8.
Feel free to send @moderators a message should none of these options work & we will assist you in any way that we can to figure out why you aren’t able to access the member categories of the forum 