Change Module image

I submitted Synthrotek Combine OR module. Being a noob, I realised AFTER I sbmit the picture that it was not suitable to be used in the racks.
How can I correct that?
I edited a pic so it should be OK now but I don't want to add a thiord instance of this module....

On the detail page of the module you should find a link Edit Module (top right).
For now I have unlisted the module.