Forecasting returns and prices

[niki999]

Dear all,

I have the following model (EWMA)

rt=m+at
at=sigma(t)*error(t)
sigma(t)^2=lambda*sigma(t-a)^2+(1-lambda)*r(t-1)^2 (EWMA)

I forecasted new sigmas using EWMA for 10 days but I am a bit puzzled how to forecast rt and prices when i know EWMA calculated volatilities and how to do that in Eviews. Calculations for EWMA volatilities I done in EXCEL.
Can anyone help me?
Thanks.