Install a plugin called Code Embed. Without this plugin it won't be possible to use Martialytics Booking widget in your WordPress site. Click on Plugins then Add New. Search for Code Embed and click on Install Now.

You can also download that here: https://en-gb.wordpress.org/plugins/simple-embed-code/

Go to the page in your WP Admin that you want to display the Bookings Widget on and in the drop-down menu under Screen Options click the Custom Fields checkbox.
​

Scroll down the page until you pass the content entry area and reach the Custom Fields heading.

Click Enter new.

Type CODEmartialyticsBookingsWidget in the Name field and paste your Widget code from Martialytics into the Value field.

Click the Add Custom Field button.

If you're prompted about a WordPress security issue, click Whitelist twice.
​

Scroll up to the Content Entry area and type the following where you'd like your Bookings Widget to sit: {{CODEmartialyticsBookingsWidget}}
​

Click the Update button to save the changes to your WordPress Page.