I'm following along a video tutorial, and the next step is to click on Boundary Boss/Base ... but it's not there.  No such icon.  Only Extrude, Revolved, Swept, and Lofted.

How can I edit the Features toolbar to see it?  Is there another way to access it?

BTW,  am I the only one who finds the official help/tutorial system very frustrating?  I found a help entry "Customize Toolbars", and the first things is says is "To return all toolbar options to the system defaults, click Reset To Defaults."     But it doesn't tell me where that button is !!!!    The first tutorial  ("30 minute"), the first instruction is "Click Extrude Boss/Base".  Uh, duh, that icon is grayed out.    Guys, I'm new!   It took me 20 minutes with Google to figure out how to get past that.