The Cashflow forecast report is for future periods only and cannot include actuals.

For a Report that includes Actuals YTD and Forecast for the rest of the Financial year, use the Bank Movement report, this is a slightly different format to the Cashflow Forecast, but will give you the same Closing Bank figures, and can be easier to understand as it relates directly to the budgeted figures, with adjustments added for movements in GST etc.