Hi there, the domain mapping upgrade for ethiconomics.co.uk is associated with a different WordPress.com account (not the one you are writing from), so to make any changes there, we'll need to receive a request from the username associated with that upgrade.
And in order to assist, we'd need to know if you want to use website.ethiconomics.co.uk as an additional address (in which case you'll find relevant steps here) or if you want it to replace your ethiconomics.co.uk mapping.