Insert the SpeedTouch Setup CD-ROM in your computer's CD-ROM drive. An icon should appear on your desktop.

Click on this icon, and then open the OS X folder.
Double click on the SpeedTouchUSB.pkg icon to start the installation. You may be asked to enter an administrator password to continue.

Accept the license agreement and select an installation destination to continue.

The Speedtouch software should now be installed.
Once it has completed, Click on Apple Menu > System Preferences > Network.
Select 'New Location' in the 'Locations' drop down box and name it.

Select your Speedtouch modem in the 'Show' drop down menu.
Click on the PPP tab.

Enter the account username and password you have been provided with.
Enter 0 in the 'Telephone Number' field.
Click on 'Apply Now'.

You should now be able to connect to the Internet with your Broadband service.