I did exactly as in that link but, when im trying to login to UAG with my domain account, i am not getting any extra RSA windows to do the second authentication.

It should ask for your RSA credentials immediately ... before you login with your domain credentials!

OR:

You dit confugre the gateway appliance as an  authentication agent in the RSA SecurID server?

Are you able to upload the authbroker.log ? This file is located at: /opt/vmware/gateway/logs

I've manage to make it working, thank you.

One question is there any option to use Push on Mobile App? or the only way to authenticate is passcode?