That would be
Menu> Preferences> Package Manger.
If this is your first time,
Reload. The "Quick Find' will show up after a first time reload-restart. If you're going to do a lot of software investigation (Why not?), pick a repository closer to your currently location via the
Setting> Repository menu. It's not necessary, but can help with speed, depending on how much you do.
Poke around. Click a wrong button. At this level of interaction, it's hard to do damage more painful than the loss of time/money installing/re-installing. The education is always more valuable.
When you have a updated list of available package, search for vinagre, tick the box to add/remove package(s), go wild.
From the command line that would be
Code:
sudo apt-get update && sudo apt-get install vinagre && echo 'GO WILD'
going wild is not essential.