How do I upgrade pidgin?

[Lady Whitefox Nunya]

     Dear Sirs,
 I was looking for a video chat program for ubuntu, I found a web site that told me pidgin has this. I read that all I need to do is install or upgrade to pidgin 2.6.1 I have pidgin 2.5.5 how do I go about upgrading it. 
 Please keep in mind when answering this I am very new to all of this and I do not understand all the technical terms. Please put your answer in terms that a child can understand because when it comes to all this I am just like a child.

Thank You Very Much,
  Lady Whitefox




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