The Templates Project is a functional project that focuses on the development, documentation, improvement, usage and debugging of templates. Unfortunately, you do not currently meet the requirements for membership.
Based on your linked space page, it appears you are working on a free-space project and are trying to create a new template. If you are wanting to propose a new sticker, you can do so following the instructions located at Help:Stickers.
If you are wanting to propose a new Project Box (such as those used on your space page), these are not currently available for free-space projects and would need to be otherwise coordinated with a top-level project.