I have a multibit wallet and I don't see any funds

[BitDraig]

This  may be  a daft question.  But can I use my Bitcoin private key to get my bitcoin from Coinfloor?

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[hosseinimr93]

This  may be  a daft question.  But can I use my Bitcoin private key to get my bitcoin from Coinfloor?

No.
Coinfloor is an exchange and you cannot import your private key(s) into an exchange. If you want your fund to appear in an exchange, you have to make a transaction to your deposit address.
Note that in exchanges, you have no control over the keys and therefore and there is no import/export private key(s) feature.

[BitDraig]

Thanks.  Once they are then back in a wallet then the private key comes into play again?

[Pmalek]

Thanks.  Once they are then back in a wallet then the private key comes into play again?

Yes, but not any private key. The private key that corresponds to the public key and address where those funds were sent. Each address has a different private key, so you wont be able to use that key as an universal recovery key (aka recovery phrase). You might want to consider creating a wallet that shows you a 12/24 word seed instead. You write down the seed only and forget about individual private keys.

[HCP]

Thanks.  Once they are then back in a wallet then the private key comes into play again?

More correctly, once you get the coins from Coinfloor into your Electrum wallet... then your Electrum seed phrase comes into play.

If you have those 12 words, you'll be able to recreate your entire Electrum wallet. That is to say, any and all private keys that it generates from that seed phrase. Those 12 words are all you require. Make sure you have them securely and safely backed up offline.

Do not store a screenshot of them, do not store them unencrypted in digital form on an online computer or cloud backup service etc.