There are several spreadsheet software packages available. The most famous one is Microsoft Excel.

However, if you do not have Excel, you should download another spreadsheet software.

I recommend you download OpenOffice, which includes a spreadsheet (Calc), a writing and a presentation software, similar to Microsoft's Excel, Word and Powerpoint from Openoffice.org.
OpenOffice recognizes doc, xls, ppt, rtf and other formats.

An alternative is to use online software like Google Documents. If you do use such a software you could share your work directly with your professor instead of having to upload it via Blackboard.

Here are some links to tutorials on Excel.

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