Creating a new monitor is extremely easy. Just send an email to firstname.lastname@example.org with the URL to monitor.
After sending an e-mail you will receive confirmation of setting up the monitor.
In each email sent by the service there are options available, i.e.
Monitor removal (reply to email link)
Change monitor parameters - this is done using a visual editor
Every time you receive a change from the monitor you will also receive a link to change parameters.
After entering this link, you'll see a box with a page dump where you can check the box to be monitored - if you don't do this, the entire page will be monitored.
Each time you receive a change from the monitor, you will also receive a link to delete the monitor. This link is a "mailto:" type which directly creates an email message in your email client by completing all parameters. You only need to send it to remove the monitor.
After removing the monitor, you will receive confirmation of this operation.