Process flow connectors

I have a number of questions about formatting the process flow that I have drawn up that are currently driving me pretty wild:

  1. How do I permanently link a connector to an activity so that the arrows don't completely unlink and move around every time I have to shift things around? (when I move everything right a bit I find all the arrows are unlinked again and I have to figure out where they belong)
  2. Is there a way to align things
  3. Is there a way to equally distribute things

Thank you in advance for helping me!