Hello,
First of all I would like to know which computer you are using as well as the mobile device that you are trying to connect.
If the computer has the bluetooth option, you should first turn it on as well as the bluetooth of your mobile phone and let the device be recognized. Once it is, select the file/ pictures that you want to send via the bluetooth and select the send option to the computer name that has been recognized by your mobile. The computer should by then ask you if you want to save the file that is being sent. If so, click on Save As and thats it.
Now if this does not work, the same issue has already been discussed in the thread http://en.kioskea.net/forum/affich 19254 connect phone to laptop by bluetooth and it will depend on the mobile brand that you actually have.
Good Luck