Hi louner
Welcome to the forum.
You might want to have a look at the following FAQ which explains where everything is;
www.benefitsandwork.co.uk/guides-for-claimants/faq/forum When you report a change of circumstances, they may ask what has changed and when you will then get a a new claims form to complete.
From your post unless your condition has improved why are you reporting a change of circumstances if you are already in the support group? It will make no difference to your claim.
If your condition has deteriorated then I would do nothing until you are next sent a review form, and then inform of a change in your condition.
If your condition has improved then contact DWP straight away and inform them.
Gary