How to get permissions to post comments in the new SAP Community such as Coffee Corner etc

hi all,

Ive been looking around the new site today and wanted to post a comment in coffee corner, and indeed in the Q&A section as well but each time I try I get this message:

"We're sorry, but you do not have enough permissions to post a comment.
If you believe this to be in error, contact your system administrator."

So imy question is what do I need to change to allow me to post comments?

thanks,

Ian