Welcome Polaris,
If no one responds to the question re: the wlan modem in a reasonable time I would suggest posting in EITHER the wireless or newbie sections. Some people will not realize there might be questions about connection issues in the Introduce Yourself board.
The type information needed includes: is it a plug in USB modem or built in, whether you are using version 8 or 9RC of Mint KDE, have you enabled proprietary wireless drivers, if you verified that wireless networking was enabled in network manager, output from
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lspci
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inxi -N
If you have a network cable plugged into your lan port, unplug it and try the wireless again.
If you want to post back here that is OK, but I have no experience with KDE nor USB wireless adapters and the problems which come with them. [If you have an on/off switch, it is on, right?

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