Hi Eunice,
You can do the above in the model analyzer app itself. Once you are done with the fitting (either regression or mixed effects), you can view them in the new plot. Click on the "New Plot" in the "home tab", this will open an empty figure. You can drag and drop the results of the fitting program into this plot.
This plot will show you the comparison of the fitting with the experimental data.
See the snapshots below!
-Achal