When you apply for deputyship one of the things that you are asking the court to make a judgement on is for a person to be appointed as deputy (usually the applicant). I dont think you can change this without reapplying for deputyship, although you can ask for joint deputyship.
Age UK and Citizens Advice will both help with filling in the forms if this is a problem.
Age UK and Citizens Advice will both help with filling in the forms if this is a problem.