Hi Charlotte
Welcome to the forum, you might want to have a look at the following FAQ which explains where everything is
Welcome to Benefits and Work Your question is outside the remit of the forum.
We would advised you to seek help from your local Welfare Rights Organisation before you complete your application for UC as once you apply for UC you cannot go back. You can find your local Welfare Rights Organisation to help you with advice by clicking on the link below and putting in your post code, it will then come up with a MAP with a list of agencies.
advicelocal.uk You may be better off on legacy benefits depending on your circumstances.
In answer to your question you would put a note on your journal and inform your work coach.
Gary