Where the heck are the mission objectives???

[Dude]

Ok I did it (save, reload, save, reload)



Now I have the (+), I select a mission (Poland invasion)



It gives me the details and description and then what?????????

If I press the X and go to the Kapitankorveten to start the mission he tells me that I have not select a mission.
How do I start the mission from briefing the MAP?????