Tab Widget comes as built-in widget in all Premium Themes and it allows you to insert Posts, Comments, Tags content as a Tab Content.
Here is how to use it:
1.Login to your Admin Panel
2. Navigate to Left Menu -> Appearance -> Widgets
3. Insert ‘Tab Widget’ into some of the available widget areas (‘Sidebar’, ‘Homepage Above Columns’, ‘Homepage Column #1’, … ‘Homepage Below Columns’), fill widget settings:
4. Save change and open the corresponding page to see widget display: