@Christelle I have found my answer here: (cant put link even to my own post or forum tutorials, it's quite complicated to put any valuable content with these restrictions)
rosemow writes: You need to have 25points and 15 posts before you can become a full member and can then have an Avi picture, post pictures, have a signature, start new threads, edit posts , post links that show up correctly and have quotes appear in grey boxes . This thread explains about it.
You receive a point each time another simmer presses like or awesome or insightful on a post that you have posted in a thread created by another simmer.
You will be able to post links, post pictures and use BBCode when you become a full member.