It is either WEP or WPA wireless security, not WAP ??
--and if windows OS sees it, you have the code there on the windows OS network setups, you should be able to copy it to a removable device, eg a USB drive and then reuse that code under Linux OS (copy & paste function)Wireless security protocols (WEP or WPA)http://windows.microsoft.com/en-SG/wind ... ss-networkhttp://compnetworking.about.com/cs/winx ... dowsxp.htm
It would also help to know the hardware you are using, that is the router device and the Network device (NIC-Network Interface Card) usb or built-in (included on the mainboard of the computer..)http://beginlinux.com/twitter/1096-ubun ... less-setup
You possibly need a gksudo to prefix the network manager application when starting the network, if you are not using the admin (earlier Mint versions) or sudo group (later mint versions) account to setup that wireless client
--if you are, then the save option if the data entries you used are correct will save the file for you..https://help.ubuntu.com/community/RootSudoUbuntu some manual setups, user specified may not be saving ?https://bugs.launchpad.net/ubuntu/+sour ... bug/283233
It doesn't hurt to scan through this material, it is a quick read, just pay attention only to what your edit problem is!
--that's a way to avoid reading every item and piece of information
--you will have to check exactly what you are entering as data, or just try making a new connection, leave the one that fails in place, until you see if you can save the data!