i am sorry but you can't change the year in the tabs.the tabs are only made up for the beginning of the year to the end of the year.however don't get discouraged you can go to the date you want to change and where it says add edit or delete click edit than at the top right you will see the words report with two logos one is a pdf( red and white logo) file click that and you can print out the items with the date in question than delete it from your 2017 items. than proceed to the 2018 tab and put your items in again from your printed copy .printing your copy will save you a little time and allow you to reenter into the 2018 tab .hope this works out for you
