I sent my bitcoin to Kraken Direct (Glidera) to sell but the they are not showing as being received.

Kraken Direct (Glidera) cannot credit your account and process the sale until the bitcoin transaction has six confirmations. Once the transaction has six confirmations the funds will be sent to your bank account.

You can search Blockchain.info for the transaction ID that is in your wallet. If the transaction has less than six confirmations than there is no issue and the sale will proceed when six confirmations are achieved. 

If the transaction has more than six confirmations please submit a support request.