To set up available currencies, you need to go to "Wallet" page. There are three ways to access there:
Method 1: Through the top menu on "Balance" tab
In the top menu of interface, find "Balance" tab.
Click on "+" icon next to your balance display.
You will be redirected to Wallet page, where Top-up tab is open by default
Method 2: Through the vertical profile menu
In the side (vertical) menu of your profile, find and click on Wallet tab.
You will be redirected towallet page, where "Top-up" section will be immediately opened.
Method 3: Through "Services" section in the top menu
In the upper horizontal menu, click on "Services".
In the drop-down list or list of services that opens, select "Wallet".
You will find yourself on wallet's page, in Top-up section. There, click on "Settings" tab
In this section, select the currency in which the operating balance in system will be available.
Check or uncheck boxes next to desired currencies. To apply changes, be sure to click "Save" button.