There are many different ways in which you can install software on your Raspberry Pi. Using apt-get is one way. Another way is by using a GUI tool such as the Synaptic Package Manager. Unfortunately, it isn't installed in Raspbian by default, but it is easily installed using apt-get.
To install synaptic, run the following command in LXTerminal:
sudo apt-get install synaptic
Synaptic will take a few minutes to install on your Raspberry Pi as it is a reasonably large application. You will find the Synaptic Package Manager in the Other submenu in the main menu.
The Synaptic Package Manager
You can search for packages in Synaptic using the search button:
Simply click on the Search button and enter the package that you are looking for.
Searching for a package
After clicking on Search, you will be shown all the packages that meet the search criteria. Simply check the packages that you want to install and select Mark for Installation...