Before setting up your online booking engine, please ensure that your Room Rates are set first. If you haven't done so, please visit here for an instruction: http://support.roomsy.com/knowledge_base/topics/creating-a-rate-plan
To setup your Online Booking Engine, go to [Settings] > [Booking Channels] > [Online Booking Engine]
Copy the Online Booking Engine Widget Code as shown below
Then, paste it into your custom website where you want to install the online booking engine. You'll need knowledge in HTML and have access to your website's code to make this work. Otherwise, please contact your website's administrator to complete this task.
Then, you'll have your website setup for online booking.