Sorry about that. At present, Google+ is not supported fully. The option is there but actual implementation for it to show up on the top right corner of the page is not done yet ( at present, it is not an error but an omission if it does not show up). I am planning to release an update this week including the Google+ icon and thought will make you wait until then when I will have it ready for all. When you switch to the update that is coming, you should see the icon pop up. Will send out a message when the update has been released. Thanks.