Default Text Problem

Hi,

I have a couple of authors on my site that writes articles every day, in the end of every article we put a code that looks the same on every article. In order to not to have to do this by hand every time we now need way to insert this by a button click or something.

The code we use is this, [ stextbox id=”black” ]some text[ /stextbox ]
And then the author changes the text inside of that.

I have checked out all of the post template plugins, but not many of them works for author that not are admins on the site.

Can someone help out on this and give some ideas on how to solve this problem, it would help us a lot of we could solve this and make it easier to write articles.

Thanks