Welcome to the forums! It is so very nice and special that you have created a room for this week's challenge ! Thankyou so very much!
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 sim.
You can still post your room in the challenge thread even though you are still a new member https://forums.thesims.com/en_US/discussion/815547/one-room-one-week-one-theme
It would be good to make a post in the room challenge thread that uses the entry form that is in this post https://forums.thesims.com/en_US/discussion/comment/13311083/#Comment_13311083