No problem. One line of code change can replace the widget with bot.

You can show up Mailcastr bot when someone clicks on a button on your website.

When Mailcastr widget is initialized it will trigger an event called mailcastr-bot-loaded. You can listen for this event and set-up your custom logic for showing chat widget.

Following example will show you how to open the widget popup when clicking on a button with id button_to_open_mailcastr_widget. Place this code before Mailcastr bot snippet.

<script>
window.addEventListener('mailcastr-bot-loaded', function (botEvent) {
var button = document.getElementById('button_to_open_mailcastr_widget');
button.addEventListener('click', function () {
  botEvent.detail.show();
});
});
</script>

Use botEvent.detail.hide() if you want to hide widget popup when clicking on a button.

Definitely. It wouldn't take more than 5 minutes for your developer.