Post History

Currently, the only purpose a link to a SE account serves is to associate imported content with your CD account. Since Code Golf doesn't _have_ any imported content from SE, there's no option to link an account.

In the future, if content is imported, there will be an option to link your account and claim your content.

There have also been suggestions for a self-serve import tool that would allow you to import specific posts of your own from Stack; if that does get implemented, we'll probably wind up having to set up linking accounts on pretty much every CD community.  
For now, though, the option is only available on communities that have imported content.