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 1
Now goto point edit mode and select the front face. Figure 2
Figure 2
Now select the "Bevel" modelling tool and click in the viewport and drag until its about halfway like in Figure 3.
Figure 3
With the faces already selected, extrude them out a bit like in Figure 4.
Figure 4