no, if you want your post to be resteemed you have to resteem anyone from the group
one resteem = one post
that's mean, you resteem once and you can post once in the group , read the rules here :
The rule of The Resteemers is: ''Resteem to be Resteemed''
If you still don't understand contact me in my facebook : https://www.facebook.com/snouci
Thanks