Hey if u want to put the poster on ur page here's how:
Save the pic and add as if it were a new creation but click other for the tittle pic and hit ok. once u make it in the HTML copy and paste that on the edit ur page html stuff. Till later and check me out if u got time.
Happy Mociversary! Merry Christmas! And happy New Year! Cool stuff here! Also, I read on your home page that you couldn't figure out how to add you poster to your home page. You can do this by clicking "add a new creation" on your home page, then uploading the poster onto there, and then copying the HTML code and pasting it onto your home page. Then you can exit out of the "add a Lego creation" page. Hope this helped!