There are two ways to add custom text/html on a booking step.
Through a Booking Form Customizer
Open a step you want to add custom text to and type the text you want to appear in before or after text input blocks:

You can double click a word so the toolbox appears where you can define bold text, set a link or a header.
Through an Action Hook
While using booking form customizer is simpler and quicker for basic needs, sometimes you need more control or more complex html. This is where action hooks come into play. We have two hooks for this: ‘latepoint_before_step_content‘ and ‘latepoint_after_step_content‘, they receive a single parameter called $step_code.
Here is how to use it in your theme’s functions.php file:
// BEFORE STEP CONTENT
add_action('latepoint_before_step_content', function($step_code) {
if($step_code == 'booking__custom_fields'){
echo 'Custom <strong>HTML</strong> that will appear before step content';
}
}
);
// AFTER STEP CONTENT
add_action('latepoint_after_step_content', function($step_code) {
if($step_code == 'booking__agents'){
echo 'Custom <strong>HTML</strong> that will appear after step content';
}
}
);
Possible values for steps are:
$step_codes = [
'customer',
'booking__locations',
'booking__services',
'booking__service_extras',
'booking__custom_fields',
'booking__service_durations',
'booking__group_bookings',
'booking__agents',
'booking__datepicker',
'verify',
'payment__times',
'payment__portions',
'payment__methods',
'payment__processors',
'payment__pay',
'confirmation'
];