How to add a taper/draft angle
Here is the basic Step by Step tutorial for how to add a draft in SolidWorks
Make a plane at the lowest point of the surfaces to be drafted, or in this case the Top plane.
Select the Draft tool
Enter the degree you wish to draft the faces (in this case 5º). Select the plane from step 1 as the Neutral Plane, then select the faces you wish to draft.
Click the green check mark and your done!