Prism's nonlinear regression dialog has ten tabs (eleven if performing nonlinear regression from the multiple variables data table), explained here. It can seem overwhelming at first. But you don't have to learn about all the choices when you first fit a curve. Start by focussing on the choices in the first (Fit) tab, and then learn about the other choices later.

•Before learning all the details, first understand the big picture -- the basic steps required to fit a model to data.

•So many choices! Which ones are essential?