WordPress do not have an option to access the head code. With the use of Insert Headers and Footers plugin by WPBeginner you can easily insert codes in your WordPress headers and footers.
Or feel free to use alternative called SOGO Add Script to Individual Pages Header Footer
Copy the Embed Code from Reebo
1. In Reebo click on your Project to open it
2. At the top right, click the "Connect Reboo to your website" button
3. Click Copy to copy the embed code
Adding Code to WordPress
4. In your WordPress Dashboard, install SOGO Add Script to Individual Pages Header Footer
5. Activate the plugin in WordPress
Now the plugin is installed and you have two options:
A) if you want to use the Reboo code on all pages, click on Settings > Header Footer Settings and paste the code into the Header box.
B) If you want to use the Reboo code on just one page, go to your page > Scroll down > Paste the embed code on the Header Code box and click Update