First thing to do is get the software....

http://www.teamspeak.com/ from the download section get TeamSpeak 2 Client

Install the software which takes just a few miniutes.

Now to set up your Teamspeak:

Open Teamspeak, on the menu bar click on 'Settings' then click on 'Sound Input/Output Settings'

This box will open...



Click on the button 'Push to talk'

Click on 'Set'

Choose a button on your keyboard that will not interfere with your game and press it

You can test that the key you chose is working by clicking on the 'Activate local test mode' button and pressing the button you chose a few times, the little green box will light up if there is a connection.
Remember to 'Deactivate local test mode' when finished.

NEXT

Again, on the menu bar click on 'Settings' then click on 'Options'

This box will open...



Make sure the setting here are correct for your soundcard.
'Wave' should be chosen.

NEXT

Again, in 'Options' click on 'Sound Notifications' and check the box 'Disable all sounds'



NEXT

Again, in 'Options' click on 'Other' and check the box 'Show icon in traybar' & 'Always on top'



That's it your TS2 should now be set up and ready for connecting to the server.