Need to edit sticker Template:Notable
Hi K,
Would you happen to mean Template:Notables, the Project box for the Notables Project? Or perhaps you mean Template:Notables Sticker?
If there are any changes that may be needed, have you consulted with the Notables Project? The Notables Leaders would need to be involved with any changes, and depending on the type of change needed, we may also need to involve the broader community.
Regarding the TemplateEditor group - that is a system role for those who are members of the Templates Project. It provides creation and edit access to the Template: namespace. This level of restriction is pretty important, since changes to templates need to be handled very carefully. They can cause major resource usage on the server, will affect tons of profiles, and can be easily broken.