How to uncheck "always use" box
 

Gooday all. I checked the box to always use konqueror to open links in email. Well konqueror is unable to do so and now I want to be able to use firefox to do it. Can some one tell me how to uncheck the "always use" box. Thanks in advance, James.

I'm not on Linux atm so YMMV! In your home folder there should be a .kde folder, in there are all the settings for your user account for KDE. Have a dig around there (probably in .kde/share) for Konqueror settings. There should be a file for Konqueror and in there a setting to change from True to False.

Sorry to be so vague, the joy of Windows :), I'll see about verifying later.

Start kcontrol (You have not told us your distro, so the easiest is to start it from a terminal kcontrol (then press return!))
A window opens. navigate to KDE COmponents -> Component Chooser -> Web Browser.
Make changes. [Apply]
Should fix it.

Thanks so much for your assistance. My distro is KUBUNTU and I just updated it to the most recent edition. I have had a look in both places suggested and am un able to locate the specific reccomendations. I will go through it more carefully tomorrow, right now I NEED a beer. Thanks again you blokes.

Kubuntu:
K -> System Settings -> KDE Components -> Default applications -> Web Browser

Thanks for your help. Regards, James.