After choosing Isoparm, in the tutorial he made a doted circle in the bottom of the sphere. How can I do that? 1. Right-click over the selected object and choose "isoparm". 2. Left-click on the isoparms (blue circles) and move your mouse still holding down the left-mouse button which will give you dotted yellow circles. Hold shift to create multiple. 3. To insert new isoparms, in the "surfaces" menu set, go to edit NURBS>insert isoparms (or for quick press space bar in viewport>edit NURBS>insert isoparms)