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I think that must only appear for moderators. I have no coloured box.If you want to add to an old thread, look at the right hand side at the bottom of the thread and you should see an orange coloured click box marked Unlock Editor or some such text.
Click on that button and you should be able to add a post to the thread.
I am a bit late replying to this, apologies.
Would you like me to unlock the thread in question?
JimB