Even though I have set up my website, a blank page is appearing.

[JlarBo3]

Hello, I have set up my website but a white page keeps appearing. When I type sirketnet.com/index.php, it takes me to the website address. However, when I type sirketnetnet.com, it doesn't take me to the website address. It's a great social networking script that I can provide to those who want it. Please help me with this issue, I have been struggling since last night researching and have not found a solution.