Only a Game Master can see and manage the Currencies link. Once in your campaign, at the bottom of the left nav, click Currency. To add a new denomination, click the green "New Currency Denomination" button in the top right. Set up currency as it will work best for your party. If your game includes a super high-value currency (Ex. platinum) that members don't often track, feel free to leave it out and stick with tracking larger sums of gold instead. For more in-depth explanation, please see the Guidebook.