The "Opening Excel Data Source" dialog box contains:
(1) a checkbox titled "Read variable names from the first row of data." If selected,
this option causes the first row of data in the Excel spreadsheet to be read into a special row
above the data in the Data Editor.
(2) A field labelled "Worksheet" which allows you to choose which Excel Worksheet
you wish to import. If the Excel file contains only one worksheet, you do not need to specify this option.
(3) A field labelled "Range" which allows you to indicate the range of cells from the worksheet 
that you wish to import. If you wish to import the entire worksheet, you do not need to specify this option.

To continue, hit Tab until the OK button is selected, then hit Enter.