It's not being dumb, its all a learning process ;)
Step 1. Make a vaguly Enterprise shaped cylinder (I started to, then realised i was too lazy to do it properly

)

Step 2. Select the edges on the outer rim. As you can (hopefully) see, only the vertical edges have been selected. The diagonal ones are dotted, but still selectable.

Step 3. Chamfer them to roughly equal sized faces

Step 4. Select all the verts at the top of the triangluar faces you just created

Step 5. Move those up to the verts on the next row and weld

Does that clear it up, or have I just made you more confused?