my main currency for paypal is GPB but i want all my curncies in us dollars now i have in EUR and CAD i want to convert them to US do you know how ?
I think you can... just see in it your account... if you can't then the option to change will probably not work
No need to do this. If you have to pay anything in USD it will be paid from the other currency and directly changed to USD. If you want to withdraw the money it will be in the currency your bank account is in.
Have you properly checked your account. You can have multiple currency balances. But you can withdraw money in your primary currency or the local currency if Paypal supports your country.