Hi Michele,
I think there may have been a typo in the amount that Mollie mentioned, that reply was quite awhile ago. Here's the full directions for using gelatin, from the Baker's Tips on the recipe online:

To make the frosting: In a small bowl, sprinkle 1 teaspoon powdered gelatin over 2 tablespoons cold water; let stand for 5 minutes. Heat briefly in the microwave, stirring every 5 to 10 seconds until dissolved. Add 1/4 cup amaretto liqueur and set aside. Combine 1 cup (227g) mascarpone cheese and 1 cup (227g) heavy cream in a large bowl and whisk at low speed until the mixture is smooth. Add 1/3 cup (35g) confectioners' sugar and increase speed to medium. Once soft peaks form, add the gelatin mixture at low speed. Increase speed to medium and whisk until medium peaks form.

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