Hi there, I’m really new to blender and learning to model. I’d like to model a pencil so I found this tutorial: http://homepage.mac.com/ycarry/Wings/Pencil/Pencil.html and I’m stuck between step 1 and 2

When I make 6-edged cylinder, the top and bottom are made of triangles (and not 1 piece as in wings tutorial). I want to “join” those triangles so I’d get top in one piece and bottom in 1 piece.

I tried selecting multiple triangles and pressing Fkey, but it goes until I have “plain” and 1 triangle left, when I try to join last two pieces I get error “Cannot make polygon with interior vertices”.

So, how can I “join” those triangles?