how do i etch glass?

i bout a bottle of gallery glass brand window etch medium, but it does not give instructions. can someone explain the process to use this brand. i also have armour etch cream can someone explain the process to use this product. i want to create frosted glass and also simple frosted designs on table tops and so forth. i am a glazier, so i have acess to all the glass i want so i do small craft projects for a hobby. thanks