How To Add Axis Labels In Excel [Step-By-Step Tutorial] First off, you have to click the chart and click the plus (+) icon on the upper-right side. Then, check the tickbox for 'Axis Titles'. If you would only like to add a title/label for one axis (horizontal or vertical), click the right arrow beside 'Axis Titles' and select which axis you would like to add a title/label. Editing the Axis Titles