Click ‘Add New Item’, then select ‘Wiki.’

You will be taken to a settings page. Add the title, description, introduction, etc. Make sure to check the ‘Online’ checkbox so that the wiki is active, then click ‘Add Wiki’.

Next you will be taken to the wiki page. Click the ‘Edit’ tab to add content to the wiki. Select the type of content you want to add from the list provided.

Click ‘Save’, ‘Save and Return’, or ‘Save and New’ before clicking ‘Finish Editing’.  
‘Save and New’ will add another text box below the first to allow you to continue. 
 
At the top of the Wiki page, you are also able to view the edit history by clicking the ‘History’ tab.