To Embed a Google Calendar:

Using Chrome, open Google Calendar.

Click the Settings icon and select Settings.

On the left side of the screen, select the calendar that you want to embed

Select (or scroll to) Integrate calendar and copy the <iframe> embed code

Next, go to the Step in your Trainual where you want to embed the Google Calendar.

In the Text Editor, click the 3-dots to the right

Press the < > icon to open Code View.

Paste the Embed Code, then press the < > icon to leave 'Code View.'