When I right-click on a folder in dolphin there is no option to compress that folder.
How can I add this to the context-menu of a folder like:
create archive from folder --> zip,rar,7z,...
You can try to install "Extract And Compress KDE4 Service Menu" to have a context menu to compress and extract files and folders.
These are the steps:
1) Open a Terminal and install these packages.
sudo apt-get install dolphin kdebase-bin kdesudo rar unrar p7zip-full
2) Create a soft link to kdesu in /usr/bin , which is necessary for the script to install the service.
sudo ln -s /usr/lib/kde4/libexec/kdesu-distrib/kdesu /usr/bin/kdesu
3) Open Dolphin and go to Configure Dolphin > Services > Download New Services
4) Search for "Extract" and "order by" Most downloads. Then click on Install button to download the service to your machine.
5) Open a Terminal window to install this service.
cd ~/.kde/share/apps/servicemenu-download/
tar xvzf 84206-ExtractAndCompress_v1.4.4.tar.gz
cd ExtractAndCompress_v1.4.4/
./install.sh
6) During the installation choose systemwide (requiere root password)
7) Put your root password and when you have to select a path choose /usr/share/kde4/services
8) To finish...Logout and Login, open a Dolphin window and when you click a file o folder you should have a context menu to compress. eg: Videos folder
hope it will be useful.