Could you please send me invitation ?! I really like the project and want to participate

How do I do that? dont know the site that well.

Sure There's a way I think I don't exactly I never run a contest before

I don't know *

Maybe you could find invite option at my profile , try it and let me know

What should be the size of the poster ?
And do you want all the information/text on one poster. It will be too much of a text.