That part means to select Sheet2 by clicking on the tab (you were in Sheet1, where you copied the visible names), then ensure that you are in column A (where your other names are located), then press the <End> key and then the down-arrow key, (which will move you to the bottom cell containing data) then press the down-arrow key once more (which will take you into the next empty cell below your existing names), and then press the <Enter> key (which will paste the names that were filtered on Sheet1, i.e. the missing names, below your existing names on Sheet2.

Hope this helps.

Pete