Rita Process Chart

Hi Guys,

I'm really struggling with Rita process chart,
First, the order is confusing for me (i looked to alot of old topics about this, and saw different suggestion: from ignore that chart, to focus 100% on it(especially the planning))

Second, i can't understand these processes (i'm not a native english speaker):

Could you please help me understand the following:

what means:

-determine planning team !

-go back-iteration 

-create forecast (forecast for what in C&M?)

-manage reserves (why this in monitoring?)it should be in Excution

Thanks in advance.