Select the date, write the concept in description, put the value of that concept in prices and that is all and if you want to add another concept press "+" and do the same you will have the sum of all the concepts of that day in your screen also if you press resume you will have the sum between the dates you have selected, if you don't remember why you have waste so much money in one day you can press that day and the screen will show you the detail of that day or if you want to modify one day, finally if you want to see all your concepts and their respective prices you can push register and then if you want you can save it in one archive of type csv and then open in number of Mac or excel (here you have to open excel and in data open the file with the correct separator ).