The Law:

Felons on probation, in prison, or on parole cannot vote. Once an individual has completed his or her sentence, the right to vote is automatically restored.

Getting Your Vote Back:

http://www.acluga.org/felony.disenfranchisement.html
http://www.georgiasummit.org/action/voter_restoration.php
http://www.sentencingproject.org/pdfs/rights-restoration/Georgia.pdf