Right click a row within the workspace
Click Add Row Above or Add Row Below from the drop down menu
OR
Scroll to the bottom of the workspace and click the gray "+" button at the bottom of the table to add a row

Right click a row within the workspace
Click Add Row Above or Add Row Below from the drop down menu
OR
Scroll to the bottom of the workspace and click the gray "+" button at the bottom of the table to add a row