You can paste the URL of the link you want to enter into your email message, @ecoorders.

Before we continue, please note that the functionality to hyperlink text in purchase forms and sales forms is currently unavailable. However, you can submit a feedback so our product engineers will consider adding this feature in future updates.
To send feedback, here's how to do it:
- Go to the Gear icon and click the Feedback option.
- Type in your comments or product suggestions.
- Click the Next button to submit feedback.
You can also review our QuickBooks Online Feature Requests website for any request updates.
Additionally, after receiving the email, you can print the transactions that were sent to you.

Have you already sent the email? The workaround I provided above will also allow you to send a message with a link. Feel free to update us if you have further questions about navigating QBO.