When Sat-Coord was installed, a template for the C/I spreadsheet was created in Excel which allows new C/I analyses to be created easily.
Open Excel and then click on File... New...
The "New Spreadsheet" dialogue box will open:
In the "General" tab there should be a C/I Interference Analysis Tool template (see here if it is not there) and selecting this template and then clicking the "OK" button will cause Excel to create a new blank C/I spreadsheet which can then be used to perform an analysis.
See here to read about how to enter data into the blank C/I spreadsheet.