如何在实例化另一个视图控制器时传递数据

I'm a beginner. I am doing a popover when a button is pressed which then instantiates another view controller where the user can select from 5 choices. I want to be able to save the sender.tag of the button from the first view controller (where code snippet below came from) and pass it to the second where I can save them together to Parse. I'm not using a segue so I can't pass it that way. Thanks in advance!I'm a beginner. I am doing a popover when a but