Installed K3b and started it and got error msg
 

i installed the K3b software, downloaded it with no problems. but when i went to open it, it gave me the following error message:

Mp3 Audio Decoder plugin not found.
K3b could not load or find the Mp3 decoder plugin. This means that you will not be able to create Audio CDs from Mp3 files. Many Linux distributions do not include Mp3 support for legal reasons.
Solution: To enable Mp3 support, please install the MAD Mp3 decoding library as well as the K3b MAD Mp3 decoder plugin (the latter may already be installed but not functional due to the missing libmad). Some distributions allow installation of Mp3 support via an online update tool (i.e. SuSE's YOU).

i installed the MAD Mp3 decoding library and the K3b decoder plugin.
what else what i need to do, or get. thanks

Did you get the software packages from your Linux distribution's software repository or from the home pages for the applications? Usually you are better off to use your distribution's software package manager to install packages from your Linux distribution's software repository. That is because some distributions don't follow the rules about where files should be located or some applications don't follow those same rules. Either way this is often the reason that an application doesn't work after you install it.

When you write a question you should always include the name of the Linux distribution that you are using and details about what you have done up to this point. So your post should include the name and version of your Linux distribution and whether you installed the applications from your distribution's package manager or by some other method.