Log in to your Bet365 account and select the 'Sports' tab. Select the markets of your choice and add them to your bet slip. Make sure you have at least three selections, as this is the minimum required for an accumulator bet. Once you have added all your selections to your bet slip, select the 'Accumulator' option.
To create your Bet Builder, you will first need to navigate to your chosen fixture or event before selecting the Bet Builder feature from the header. You will then see all the available markets and your Bet Builder odds will be calculated with every selection.