It is very nice and special that you are planning on entering the Room challenge
That is great! You can enter it whether you are a new member or a full member
Because you aren't a member yet, you can't post pictures that appear , but you can upload your screenshot pictures of your room to a photo sharing site such as imgur , then right click the picture on the photo sharing site and copy/paste the image address link in a post on the thread .I can then post the pictures for you
You will need though to replace the http in the address of the images with h.t.t.p as you are a new member and can’t post links
The current challenge for the week is always posted in the third post on the first page of the challenge thread. This is a link to it.
I will look forward to seeing your room if you decide to enter the challenge