LucidChart is integrated with Canvas. Instructors can have free access to create and embed LucidChart content.
To use LucidChart and related products in Canvas:

On the RTE (rich text editor) toolbar for any page, click the Lucid icon:
Note: You may need to click the three dots on the right to expose this button.

If this your first time, it will first ask if you have any students under 13 years old. This is probably a "No" at UTHealth.

On the next page, click "Sign up". Do NOT click "Log in" unless the sign up page gives you this error:

If you get the above error, this means Lucid already has an account with your email address
Go back and click "Log in" and attempt to login to Lucid with your UTH email address on the next page.
Do NOT attempt authentication with Google or Office365. If necessary, ask Lucid to reset your password.

From here, you will get pages with single buttons like "Continue" or "Get started". Eventually you'll see a button that says "Grant Access"--click this, and you're done!