You can place your multi-bet the same way you place your single bet. After making a selection, select add to bet slip and then add further selections to your betslip to turn it into a multi!
Please follow the below steps for placing a multi-bet:
• Click the Racing at the bottom of the app > Choose the day of Race > Type of Race > Race > Click on the selection you want
• Similarly, select your next selections
• Once done, click on your betslip from the top right corner > Enter your stake > Place a multi-bet bet