How to make glass etching cream?

I want to know how to make white glass etching cream for frosting the glass. I have already bought the white powder (dudhi) and hydrofluoric acid and

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Armour Etch Glass Etching Cream, 2.8 oz (Canadian) – RQC Supply Ltd

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Armour Etching Cream for Glass 10oz Net Weight - Please note product is filled by weight not volume. Armour Etch is a fast acting specially formulated

Armour Etch Glass Etching Cream Kit - Create Permanently Etched Designs - 10oz Net Weight - Bundled with Moshify Application Brushes