First, be sure that your PayPal account has been connected (instructions here) and confirmed. Once that is done, you can decide on the currency types that you will accept. Certain currencies require a bit of custom coding to display the proper World Currency Symbol (see instructions for doing that here).
To update your PayPal account to accept multiple currency types:
- Log in to your PayPal account
- From the main menu, click on "Summary"
- Select "Currencies"
- On the following page, select the currency that you would like to accept and click the button that says "Add Currency"