How can i configure Gwibber to show me only 1 Twitter of the group i follow. For example i wish to see a specific one of them without having to see all of the ones i am following.
Yes that is possible.
To do that, first login to Twitter.com and create a Twitter list and add the people you want to have in that list.
Once you've done that, open up Gwibber, and load the "lists" view.
Then, select a list
And you're done!
Do you mean you want to see all the tweets from only one person? If that's it, click the image next to their name like this:
That will show you only that person's tweets. To get back to the main view, click the house icon at the top left.