1) Click on 'Manage adults' then 'Create new adult' on the left hand side:
2) Complete all the fields marked with a *
3) Click the 'Create adult' bottom at the bottom of the page:
4) Next a pop-up will appear asking you to confirm that you wish to create an adult.
5) You will then be taken to a page where you can set permissions. Choose the permissions you would like the adult to have and then click 'Confirm' at the bottom of the page.