Hello again. Lets start with the new modelling tool "bevel". Make a box like in Figure1 and Convert it to a mesh by doing Build->Convert to Mesh.
Figure 1Now goto point edit mode and select the front face. Figure 2
Figure 2Now select the "Bevel" modelling tool and click in the viewport and drag until its about halfway like in Figure 3.
Figure 3With the faces already selected, extrude them out a bit like in Figure 4.
Figure 4