Do you have the following listed in the SAR? Following is the information I have:
William Ferguson born abt 1755 Ireland?, died abt 1839 Morgan Co, KY. Married Catherine Lemaster abt 1783. Served 1776 - 1779 (three years) with Pennsylvania Regiment. Filed for pension 1818 in Floyd Co, KY.

If you do, what are the steps to take for joining?

Thanks!