In most occasions support will ask for a bet ID of your bet so that they can help you if you have any issues with your bet.
Finding bet ID of your bet is very easy, just follow these couple of steps:
Find the 'My Bets' section in the left hand side menu which is located in the sports category.
After you open 'My Bets', you will get a choice of Open or Settled bets. Find the bet that you need the bet ID for and click on the down arrow. Here, you'll be able to locate your bet ID.