In order to center the worksheet titles across a range of cells, the user must ___________.

1. Open the Excel worksheet where you want to center the title across a range of cells.

2. Highlight the cells across which you want to center your title. You can do this by clicking and dragging your cursor across the cells.

3. Go to the "Home" tab in the toolbar at the top of the screen.

4. In the "Alignment" group, click on "Merge & Center". This will merge your selected cells into one and center your title within it.

5. Type your title into the merged cell. It will automatically be centered.

6. Press "Enter" on your keyboard to finalize the title.

Remember, using "Merge & Center" can sometimes cause issues with cell references in formulas, so use it carefully.