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