In your theme package you received from themeforest you can find special demo/dummy.xml file which contains all demo content.
After the installing and activating the theme you have an ability to upload file demo.xml / dummy.xml with WordPress Test Content, which can help you to understand how exactly Theme Options work
1. To import XML content on your server you need to open “Tools&Import”.
2. In new opened options list select “WordPress”.
3. If you import the content first time, you will be asked about WordPress Importer installation.You need to press «Install Now». After that new plugin will be installed into our directory wp-content/plugins named «wordpress-importer».
4.When installation is completed click on the link to activate and start up the plugin of importer.
5.Now find demo.xml / dummy.xml file (or some other exported file with WordPress data) and upload it.
6.On the next screen you need to add a new position for the particular author (usually for administrator) and do not forget to press “Download and import file attachments”.
7. Now if you go to Admin Control Panel there are new posts, categories, comments,pages, portfolios, testimonials and galleries – all these you can use to test your theme.
By data importing already saved information is not deleted or changed, simply new files adding