Can you remove iCloud from my iPad Mini 16GB? How much is a charge for

Well look like i got bad luck to read all the detail seller states about this ipad late found out it is has iCloud lock and need to be get iCloud account removed before can be use but doesn't said any thing about user id and password for this iPad.

When first got it is seem turn on and ask for WiFi after click next this device ask my for iCloud user id and password and couldn't fills them out because my iCloud id and password didn't work look like i need to find original owner so i contacted seller they response by don't know the original owner.