To add TLS1.2 you just need to add in your https virtual host configuration:
SSLProtocol -all +TLSv1.2
-all is removing other ssl protocol (SSL 1,2,3 TLS1)
+TLSv1.2 is adding TLS 1.2
for more browser compatibility you can use
SSLProtocol -all +TLSv1 +TLSv1.1 +TLSv1.2