It depends how well carbed you like your ale, and also the temp of the beer at the bottling stage also affects things. Oh and what you are using for priming sugar.
In very broad terms if bottling 21-22 litres of british ale at 18-20ðC using normal Tate and Lyle style sugar then 70-95g of sugar should be about right. If you like a northern level of ale carbing then 95g, for a flatter southern ale style then 70g should be about right.
Dissolve the sugar in a little boiled kettle water to make a gloopy sugary solution, dump that into your sterilised bottling bucket then syphon your beer in on top, quick stir with a sanitised spoon (avoid splashing) to distribute the sugar through the beer and your ready for bottling.
EDIT: noticed you are using brewing sugar (which is dextrose I think which is same as corn sugar) you use a different amount. Best to use the calculator based on your requirements.
Also, if kegging rather than bottling then same volume of priming sugar (for ales) applies.