You need to ensure that you received a message "Withdrawal successful" from the platform you're transferring your crypto to FXCE.
You can check the deposit transaction status by following these steps:
Click [Wallet] - [History], click on the deposit transaction to check. The screen will show the Transaction Details of that transaction.
1. Processing is the status of money being transferred to the account.
2. Completed shows that your deposit is complete.
***Reminder: after 30 minutes of receiving that message, the deposit has not been credited to your wallet, refer how to deal with here.