To create a simple map with centre coordinates, use the center attribute. NB: it must be spelled the American way or Google will ignore it!
[flexiblemap center="-32.918657,151.797894" title="Nobby's Head" width="100%"]
If you want the marker to be at a different point than the centre, use the marker attribute as well.
[flexiblemap center="-32.914,151.75" marker="-32.918657,151.797894" title="Nobby's Head" width="100%" zoom="14"]