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What notebook do you have?
The mic jack records the audio signal. But I assume you want to use the mic jack an line-in. Right?
Usually you have to set the default device in recording tab.
In control panel -> sound -> recording tab.
If you will not see any further devices but only mic jack then you should click right and should enable the options; show hidden devices and show disabled devices.
Possibly then you could enable line in.
Otherwise such option is not available and not possible
Sorry but can you post more useful details like MP3 player that you have and notebook?
I think it’s depending on your MP3 player and notebook if this is possible or not. Not all MP3 players support this feature.
Furthermore it’s important that sound card is listed in device manager properly. The Realtek Audio Manager is only available if you have a Realtek sound card.