Update an Ubuntu Sotware Center icon with no rights on the project

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http://ubuntuforums.org – Hi there, I'm the FOSS 'Jajuk' project admin. This project has already been submitted into the Ubuntu Software Center for a while by third party so we don't have the rights against it in the Ubuntu software Center management app [1]. The issue here is that the project icon has a very low resolution and we would like to upload a full resolution icon instead. Who should we contact ? how to proceed ? Thanks in advance. [1] https://myapps.developer.ubuntu.com/dev/ (Hardware)