Thanks for visiting the Community today, @darlingarlin. You can get the Profit and Loss report for 2018 provided that you have 2018 data in the file. You'll just need to set the date range from 1/1/18 to 12/31/18.
Open the Reports menu.
Type Profit and Loss in the search bar.
Choose the first option on the list drop-down that says Profit and Loss.
In the Report period drop-down, select Custom to filter the dates to the year 2018.