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HOW DO I MAKE A EXTERNAL BUTTON SEND KEYSTROKE VIA ARDUNIO/GOBETWINO ??????

i have never attempted any of this before and it is all completely new to me

basicly what im looking to do after seeing it on you tube is make a control panel and if i press
button 1 - the computer thinks its the space bar
button 2 - T

if that makes sense 

i have just bought the arduino uno and downloaded the gobetwino software as suggested on the youtube video but have no idea how i create this 

can some one please help me 

If that's all you need, you need to use an Arduino Leonardo. That can simulate a keyboard directly

A quick Google search found this.

Check his web site for details. As you can see in the video he is using an UNO.