RSU shares are taxed when Vested. If you vested while in the US, the income was added to your W-2.
If you then sold shares, take the amount added to your W-2 and divide by number of shares vested, to determine the Cost Basis per share (which is added to the Vest Price per Share).
You wouldn't need to reduce the income shown in Box 1 of your W-2, if this applies.
Once you know your Cost Basis per share, you can enter your 1099-B as a regular stock sale, with the correct Cost Basis.
Here's more detailed info on RSU's and Taxes.
@nevink
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