To use the source data, you also need to add the REST Request test step to the test case.
To put the source data to a request, you can use a property expansion.
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Select the REST Request test step in the project tree and open the Form tab in the input section.
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Right-click in the Value field that corresponds to the parameter you need to specify and select Get Data from the context menu.
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In the Get Data dialog, select the Data Source test step and the property you need.
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Click Add.
The property expansion will appear as the parameter's value.
Click the image to enlarge it.
Now you can add a data source loop.