Diggit Drupalextras

Hi i am new to drupal and i have followed the instructions and created a database with all the permissions and also i have created settings file in sites default folder.I am able to see the screen asking me enter the database details and save and continue.Here when i am entering the database details i am not getting any error but its not proceeding to next step ie to install sites.Please help me .I have also tried to enter the information of username and password in settings file but still i am not able to proceed to install sites.
Thanks in advance