In the upper-right corner of the wiki, click the edit (pencil) icon. An Edit Wiki page opens. It contains a panel displaying files in the channel, a panel for adding the wiki entry, and a panel for previewing the wiki entry (see the image below).
Enter text into the text editor in the center panel. A preview of the text appears in the right panel.
In the center panel, click Publish. Image Modified The content appears in the wiki: