A transaction hash/id is a unique string of characters that is given to every transaction that is verified and added to the blockchain. In many cases, a transaction hash is needed in order to locate funds.
You can find your transaction hash within your personal wallet’s transaction history, from which you have made the deposit to your gaming account.
Go to your transaction history, find the transaction to Wildcasino, and you should be able to open it in some of the crypto explorers and find your transaction hash.
Here are several examples of Blockchain Explorers that you can use when searching for your TX:
Don't hesitate to contact live support in case you were not able to find your transaction hash.