tell how

See: explain
References in classic literature ?
I would have put it off if I could, but it was not to be concealed; so after suffering many importunities to draw that out of me which I longed as much as possible to disclose, I told him that it was true something did trouble me, and something of such a nature that I could not conceal from him, and yet that I could not tell how to tell him of it neither; that it was a thing that not only surprised me, but greatly perplexed me, and that I knew not what course to take, unless he would direct me.