Switch to the Design tab and select the Curve tool and click at each place you need points. For folks not familiar w/ Bézier curves these are:
- points of inflection
- extrema at the north/south, east/west points
- usually off-curve nodes should be roughly one-third of the way towards the center of the curve — 30% is the specific number usually cited, hence terming this the “Rule of 30”.
and see: Let's draw an "ellipse" with new users — note that you may want to turn off View | Snap to grid (it can also help to turn it on to ensure that things are symmetrical/aligned).
If you wish, you can click-drag to create curves:
Then, zoom in on each section and adjust the curves and nodes to get things to align nicely.