fitting a sum of two lognormal distributions to data.

I have a data set (in the form of a histogram) with a first peak that appears near zero. The second, lower peak appear later.

A lognormal pdf is not enough for this kind, I believe, since there are two peaks. I want to use the sum of two lognormal pdf's (different mu and sigma). Please help me how to demonstrate this. Thanks

[KSSV]

You split your data into two sets.....and then apply the fit.