Nonqualified annuity prior to 1982

I have inherited an annuity that was purchased in 1981 under the FIFO method for distributions.  How do I enter through Turbo Tax .... the step-by-step questions force me to choose between the Simplified or General method for determining the taxable portion.  The FIFO method does not apply to the General method.  This is a non-qualified annuity.