Need help with program installation

If what you downloaded is the source code of a free software then the
simple manuals are always the "README" and the "INSTALL" files.

Using the package manager is always the best option to install software
from trisquel repositories.

I read the 'readme' and 'install' files, but I don't really understand them. Can anybody please explain them to me?

Some software are not available in the repositories.

I am still very inexperienced with Trisquel, but to my knowledge, if it is not available through the repositories, that's probably because it is not free (Libre) software.

As far as manuals to learn using the terminal, try this: http://en.flossmanuals.net/_booki/terminal/terminal.pdf

If you don't like pdf format, it is also here: http://en.flossmanuals.net/terminal/

That site http://en.flossmanuals.net/ seems to have lots of free manuals.

Hello Battery,
if a program is not part of the repositories, the next step is to look up whether there is somewhere a .deb file or not.
Another option is using a ppa;
perhaps you can search for something like "peerguardian ubuntu" or something similiar, and perhaps you will find a ppa (i.e. a seperate source for the packet managment system) ; be aware of ppas with proprietary software. But if you install only the free program, there should be no danger of using proprietary software.

Last option is to compile the program. It's really an exception. During normal computing, this is not necessary.
Before compiling, you should make sure that you have the build-essential and g++ installed.
With your program, a

sh autogen.sh
autoreconf
./configure
make
sudo make install

should do the trick. Precondition is you have downloaded the source code.
git clone git://peerguardian.git.sourceforge.net/gitroot/peerguardian/peerg
uardian

You need git installed for this:
sudo apt-get install git.

Hi Battery and welcome to the forums!

To install PeerGuardian Linux (later just pglgui) on Trisquel GNU/Linux, open a new Terminal window (by pressing [Ctrl]+[Alt]+[T]), and type:

sudo add-apt-repository ppa:jre-phoenix
sudo apt-get update
sudo apt-get install pglgui

To add pglgui to the list of Startup Applications (e.g. those that will automatically start after you log in), also type the following:

ln -s /usr/share/applications/pglgui.desktop ~/.config/autostart

After you have successfully installed pglgui, you also need to whitelist some of the outgoing connections. By default, PeerGuardian filters nearly all of your network traffic, and software like Update Manager, Weather applets, Tor network will simply refuse to work. To make it easy for you, here is a picture of my pglgui configuration:

Bear in mind that even after all of this, you can easily experience torrents or files from one-click hosting websites refusing to download. If this happens to you (like it happened to me), try to temporarily stop the PeerGuardian daemon by right-clicking on the pglgui panel icon, and selecting Stop as seen on the following picture:

Good luck!

Thank you everyone. I am grateful for your help and advice. I will continue to read the manuals and learn more about GNU/Linux.