If you want add a ppa repository , youu need to add some lines in /etc/apt/sources.list and also need to add the GPG key. I think it not easy for beginners. Now See a simple technique to add ppa with add-apt--repository
example :
open a terminal and add the following line for adding vala-team/ppa
$ sudo add-apt-repository ppa:vala-team/ppa
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