You have imported your multibit private key in to electrum right?
If so, than there is no option to "equip" this wallet with seed words or any advanced electrum gimmicks.
It is your good old multibit wallet under control of a new software-> electrum
(good choice BTW, multibit sucks now, it so-so outdated)
Only way to have full electrum wallet with all its options and safety features, is to send your bitcoins
to a newly created wallet under electrum.
Yes, you will "loose" some on transaction fee but think about what you will gain
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
O. and BTW have you heard about BCC? (bitcoin cash)