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If you try to import a running config file into running config (the current one runing, it will fail.)
You will need to import the runing config into startup config, save your changes and then reboot.
That will turn the running config into startup config witch will load at startup and become the runing config.
sounds confusion....its is but its how it works
This is how to do that:
Go into the Download/Backup pane in "Administration" then "Download / Backup Configuration / Log"
Choose Browse and select your configuration file, then open.
In destination type choose STARTUP CONFIG and then APPLY
Click Done, then reboot your switch, that Config will now load up.