Welcome! Well you managed to figure out how to post....that's a good first step. If you scroll down to the bottom of the page, the forums listed at the very bottom are social groups...to be able to post in those you need to join the social group. Click on the link below the title of the group and when you get to the group page...scroll down and click on join this group.
Other than that...you should be good to go....you need 25 posts to be able to use the chat room.
Welcome Natalina! I am one week new here myself. Don't worry - you will get the hang of everything...just keep exploring and posting - and just enjoy yourself! I'm sure you will love the stories and the games - and everyone here...just like I do! Have fun!
As long as we know in our hearts what Christmas ought to be, Christmas is."
~ Eric Sevareid