[eluser]PhilTem[/eluser]
Hi, and welcome to the CI forums. Hope you will have a good start here and also some nice contributions with your own classes or to other people's projects.
I think the limit for your profile to being publicly available is 10 posts, I never heard or had experienced a restriction on posting images, links, etc. before you reached a certain number of posts. However, EllisLab might have changed their policies due to too heavy spamming around the forums.
Keep on coding - and don't forget reading the CI user's guide