Click "View Tablet" to open the selected Tablet.
Click the Small Notepad icon
next to "New Item Title".
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Add your new Title
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Save your changes 
Click the Large Notepad icon
to Open the Main Content Area.
Add your content as you would using any other editable area on your pages.
Save your changes
More Help with Slates & Tablets
For help adding a Calendar to your Tablet, Click Here
For help adding a Gallery to your Tablet, Click Here
For help adding RSS feeds to your Tablet, Click Here
For more help with editing, Click Here