To change the currency of a Contact, hover your mouse over the Manage button in the header menu.
A drop down list will appear.
By selecting the option "Contacts", a new page will open up with a list of all the Contacts of your Company.
On the very right hand side of each Contact, are three vertical dots. Once you select these dots, you are given the option to either edit or delete the Contact.
Select "Edit" to edit the Contact.
A new screen will appear. On the bottom of this new page you will are given the option to select the currency of the Contact.
Click on the field below the header "Currency" and select the currency you wish to apply.
Once selected, click the "Update this contact" button to complete the request.