If you want to change the cPanel password, then this can be done by logging into your secure client area: https://www.havenswift-hosting.co.uk/clients/clientarea.php
Unlike some configurations of cPanel, you are not able to update the password while logged into cPanel.
1) Once logged in, click on the "Services" link in the menu section and then choose the "My Services" option or alternatively simply click in the box showing how many services you have. Both of these lead you to a page showing all services on your account.
2) Then click on the "Active" button for the hosting account you want to change the password details for and from here you are able to change the password using the link in the left hand column. The password that you choose must register as 'Strong' for it to be accepted