I use this type of dongle, and I would suggest ;
1. Make sure you are in an area of 3 coverage ( check can you get a signal on a mobile phone)
2. The dongle should self install.
3. If you want to check settings ; 0n the home screen go to tools, then options, then Profile management.
4. My settings are Name 3USB Modem, APN Static, APN 3internet, Access no. *99#
Advanced settings ; IP Dynamic, APS tick CHAP, DNS Dynamic, WINS Dynamic.
If above does not work, I suggest phoning the 3 Helpline who will be able to talk you through the installation.
I hope this may be of some use to you. Nodo