Help:Introduction to tables with VisualEditor/2
Introduction to tables
How and why
Editing tables
Updating information
Adding new tables
Much easier than it used to be
Expanding tables
Adding rows and columns
Summary
Review of what you've learned
To edit the contents of an existing table in VisualEditor, simply double-click on a cell. You can then change the text, links and references, just like anywhere else in the article.
To format a cell, just click once to select it. You can then use the Content cell 
menu to designate it as a header.
The A menu also allows you to make cells bold or italic.
Finally, you can merge cells, by selecting a set of cells, then clicking the 
menu and selecting "merge".
