When all the seams are marked, the next step is to unfold the model. Before we unfold the model, there is a special window type which will help us in the process of UV mapping. Create a new division in the Blender interface, and in the new window, choose the UV/Image Editor window:
With this window, we will be able to see the unfolded model and handle all types of images for texturing. There is even a small editor and paint tool, which allows us to edit and paint the texture without the aid of an external image editor.
With this window opened and all seams marked, we press the U key in the 3D View to activate the UV tools: