Are you programming in conversational or G code?
if conversational the event is the block such as start mill event # 3
go to run,start and then you have 3 choices, first, block " event" and tool#. answer ? accordingly and the green box will tell you block so and so or tool# has been found push cycle start to start program from here. if you are not starting from a tool change or tool call make sure the proper tool is in the spindle and the proper tool # and the tool offset # are displayed in the info box.