Enter a title and a “Y” axis label for the chart
Each axis of the chart are automatically created with scales based on the ranges of values in the data. They legend (key) which identifies which blocks on the graph represent which series of data is shown by default.
To change the title on the chart, simply double click on it within the chart.
To add or change the title of each axis, double click on the chart until the menu across the top changes to the Chart Tools menu. Then select the Add Chart Element.

Then select Add Chart Element.

From this menu, choose Axis Titles

From here, both the titles of the horizontal and vertical axis can be changed. Once selected, double click on the axis headings.

The chart can be moved or resized by clicking on it, as normal.