The available payment currencies, methods of payment for ad campaigns in Yandex.Direct, and additional tax charges depend on the country chosen.
It is too late to change the currency for this account. To select a different currency, you need to register a new username on Yandex and select the correct currency at the first stage of the campaign creation process.
If an advertising campaign already exists under your username, you can copy it and upload it to a new account using XLS files. To do this, first export the campaign as an XLS file from your current account and then upload the XLS file to your new account (under the XLS-file import tab).