How can I do a search?You need to choose the ingredients by which the recipes will be selected; the centre column contains the list of ingredients.
By using the << or >> buttons you can add or remove items, either in the left-hand column (ingredients which MUST be in the recipes selected), or in the right-hand column (ingredients which MUST NOT be in the recipes selected).
Ingredients preceded by * are general terms, and include a whole group of specific items. So if you look for recipes which do not contain alcohol, for example, all recipes using wine, rum, vinegar, whisky, etc. will be omitted.