I have installed Slackware (A, AP, D, L, N, X and KDE sets of packages) and it is working very well. However, the plasma-nm network applet is not working. Even though the net gets connected automatically, the plasma-nm applet does not show any connections. From its settings also no connections can be added. How can I troubleshoot and solve this problem. Should I remove plasma-nm and install network-manager-applet (though that is for gnome)? Thanks for your help.

Did you install everything?

Slackware is a complete system so if you didn't install everything, things may not work.

The problem got solved by making /etc/rc.d/rc.inet1, rc.inet2 and rc.inetd non-executable and making /etc/rc.d/rc.networkmanager executable.

Making /etc/rc.d/rc.networkmanager executable is good - that makes NM start at boot and makes your plasma-nm work.
Setting /etc/rc.d/rc.inetd to non-executable is not needed at all and not even remotely sensible. Please make that executable again.
Setting /etc/rc.d/rc.inet2 is just as ill-advisable, you are preventing a lot of network services from startup.
And setting /etc/rc.d/rc.inet1 to non-executable is also not good, as this prevents the configuration of your loopback interface. What you should do instead is merely cleaning up the file "/etc/rc.d/rc.inet1.conf" and get rid of all your modifications. The original file can be copied on top if you want, get it here: http://slackware.osuosl.org/slackwar.../rc.inet1.conf

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I only want to access the internet for web browsing and I have a printer attached to this desktop. I do not need any other network services. I want to set up so that only these services are enabled and no others. Which ones of the net files in /etc/rc.d should I make executable?