ok. thank s. i will read up and use the electum . so by exporting and sweeping , i will get back the 1 bitcoin already sent ?
Yes, you should do. If you sweep you only have to backup a string of words that you are given when you create a standard electrum wallet. They are called its seed words and are all you need to recover from a disaster. If you import your multibit private key into electrum you need to save a backup of it in case your wallet gets corrupted.