Every new user has to register at this website in order to avail the e-Filing facility. After completing the registration process and logging in, the user may download the software tools (this is and excel file) from the download section. Based on all the relevant information the required ITR Form should be filled using the software provided. The software would generate the XML format of the return which should be uploaded on this website. On successful transmission of the return a receipt will be generated in the form of a provisional acknowledgment.
If you have digital signature you can complete the submission but if not you can print the acknowledgment and send it to the tax authorities.
The web site is for individual tax returns is "ITR filing"