You have to either add the path where you have downloaded blender to your path environment variable
echo 'export PATH=$PATH:/home/joke/3D/blender/blender-2.69-linux-glibc211-x86_64/' >>~/.profile && . ~/.profile
or create a .desktop file, for example create a file blender_2.69.desktop with:
[Desktop Entry]
Categories=Graphics;3DGraphics;
Comment=3D modeling, animation, rendering and post-production
Exec=/home/joke/3D/blender/blender-2.69-linux-glibc211-x86_64/blender
#--debug
GenericName=3D modeller
Icon=/home/joke/3D/blender/blender-2.69-linux-glibc211-x86_64/icons/256x256/apps/blender.png
MimeType=application/x-blender;
Name=blender 269\s
Path=
StartupNotify=true
Terminal=true
TerminalOptions=
Type=Application
X-DBUS-ServiceName=
X-DBUS-StartupType=
X-KDE-SubstituteUID=false
X-KDE-Username=
Name[it_IT]=blender 269
obviously replace /home/joke/3D/blender/blender-2.69-linux-glibc211-x86_64/ with the real path