To create a custom report in BlazeMeter, start by logging into your account. Navigate to the ‘Reports’ section and click on ‘Create New Report’. You’ll be prompted to select the type of test data you want to include; choose as per requirement. Next, customize the layout by adding or removing widgets from the dashboard. Widgets can display different types of data like response times, hits per second, etc. Adjust their size and position for optimal viewing. Once satisfied with the layout, save the report. It’s now ready for use and can be accessed anytime under ‘My Reports’.