1. goto: http://your-site.com/wp-admin
2. Login to WordPress Dashoard
Username:
Password:

3. Click on Robo Gallery

4. Then hover on the gallery and underneath it click on edit

5. Click on Manage Images

6. Click on Add to Gallery

7. Click on Upload Files

8. Click on select files

9. Locate the images on your system and select to add them your media and click open

10. Then click on the Add to Gallery button

11. Click on Update Gallery

12. Click on update to publish your changes