How can I get the weights to be used as part of the General curve fit?

For the weights to be used as part of the General curve fit, you should enter the actual error value for each point. So if you have a value of 10 and it has an error of 1.5, enter 1.5 into the column as the weight.

When Weight Data is checked for the General curve fit, it will prompt for the name of the column containing the weights when applying the fit.