To add a new Payoneer account, you must unlink your current Payoneer account associated with uTest. If you unlink Payoneer and no longer see an option to add it, that means that Payoneer is not available in your country.
Once you have unlinked the account, you can follow these steps:
Important: It is necessary to link the new Payoneer account to your Profile. If you are not sure about the procedure please read the following article: Are You Making this Payoneer Mistake?