Another "Flatten Part" Question, Sorry.

I am essentially self-taught in SolidWorks and as a result, some things I simply have not learned.

One is using the sheet metal capabilities, so I have to ask the question...

Attached is the basic shape of a hand guard for a .22 caliber rifle; a Ruger 10/22 specifically.

I cannot seem to figure out how to flatten it and searching through previous posts is not helping me.

I would be extremely surprised if SW cannot do it, so what am I not doing or what am I doing wrong?

Thanks,

greg

edit to add: I have SolidWorks 2016 64bit, student version.

SolidworksSheet Metal