Thanks for the answers.
Yes, I'm studying the tutorials, and I find them quit good. However this problem I couldn't solve.
I did what the tutorial said and what kjoiner advised me to without success. This is what i did:
From the command bar I chose the curve-tool and draw at path (a curve). Then I draw the profile, a circle and tried to place it at the end of the path.
I then at the command bar chose add and protrusion. However, the protrusion button is not active. I tried this in many different ways, but the protrusion button is alway inactive.
I did succeed in creating the bend by using the revolve command around an axis, but I would like to understand the protrusion command as well. Anyone who have an idea of what I'm doing wrong? Could it have something to do with placing the profile at the end of the path?