Hi,You need to put a note on your journal asking for the carers element to be added to your payments.
They may not respond as often happens with UC, if they don't in 2 days then you need to ring them to ask for it to be added.When you first claimed UC did you report your caring responsibilities?
Hi @dpmw and welcome to the community. I hope Universal Credit are able to sort the carer element for you quickly. Please keep us updated!
Great news that it's been added on @dpmw. As Will said, it should be backdated and if it isn't, you have a case for mandatory reconsideration. Let us know how you get on.