Hi Earl & thanks Robert
Anyone who tested through Family Tree DNA can join the Cain DNA project by logging in at www.familytreedna.com
using their FTDNA kit number & pass code, then click on Projects", the Surname Projects starting with C, then Cain.
Anyone who tested through Ancestry can also join. Some of the markers tested are different. FTDNA sell a conversion kit. It's listed amongst their products.
The bigger our Cain/Kane/Keane database is, the more same-surname matches we all find, both for our new members & our existing members.