1. Installing the required modules
Go to the "Applications" module:

In the search bar, select the "Add-ons" filter and enter the name of the required module ("NBU currency rates" - for importing rates from the NBU, "Privat24 currency rates" - for importing rates from Privatbank, "kw_monobank" - for importing rates from Monobank):

Install the found module (Activate button):

2. Setting up currency rate downloads
Go to the "Invoicing" module:

Go to the "Settings" menu - "Update Rates service":

In the new window, click the "New" button:

In the "Rate Provider" field, specify the source of currency rates:

To download the current exchange rate for today, click the "Update now" button:

The following days, the courses will be downloaded automatically every day.