how to do simple editing without sound

Is it possible to edit clips in Openshot? I mean that I would like to cut out portions of a clip and delete them (just as I could remove portions of a text file in a text editor). In the Manual I find a section called "Slice a Clip (Razor Mode)". Here there three lines on how to slice a clip, and no information on what to do next. Perhaps I am looking in the wrong place. I understand how to move the clip to the timeline, but I cannot figure out how to remove the portions I don't want and join up the portions that I wish to keep. The clips that I want to edit have some background noise but I am not interested in a soundtrack. I need very simple instructions because I am a complete beginner in this kind of work.