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URL: The link to the page, if internal the link should just start with a forward slash followed by the path to the page, if the link is external it should include the whole URL.
Text to display: What the user sees on the frontend.
Title: This is used for accessibility and SEO.
Target: This should be None unless you wish for the link to open in a new window (useful for info sheets).
Edit a link
Select the text in the link you want to edit.
Click the ‘Insert/edit link' button, edit as noted in Add a link.
Add a column
Hover over one of the existing columns and duplicate it.
Make sure each column is at least 4/16 wide by dragging the edge of the column to fit (if there are less than 4 columns, the last column should fill the remaining space).
In the new column, edit the title text to the name of the new column.
In the new column add/edit the links as necessary.