How to install QBittorrent for downloading torrents.

Open a terminal and run the following commands :
sudo add-apt-repository ppa:hydr0g3n/qbittorrent-stable
sudo apt-get update
sudo apt-get install qbittorrent

Note: If you have an issue starting Qbittorrent, try removing libtorrent-rasterbar6 through the synaptic package manager and then repeat the installation, i.e: 
sudo apt-get install qbittorrent 

Changing your password under Linux

In Linux Mint, changing your password is as simple as opening a terminal and typing passwd.
Just follow the prompts by entering your old password and then your new password twice.
Here's an example:

$ passwd
Changing password for yourname.
(current) UNIX password:
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully

Use wisely ;)