Hello, and thank you for lending your time to help improve Wikipedia! If you are interested in editing more often, I suggest you make an account to gain a bunch of privileges. See you soon, and happy editing!
To link to a specific page that the user edited, use the parameter page. To link to a specific diff at that page, use the parameter diff. Note that diff will be ignored if page is not specified.
To exclude the green box image add no as an unnamed parameter, e.g. {{subst:Thanks|no}} or {{subst:thanks|no|page=Main Page|diff=139992}}. Note there is no happy face to the right of this paragraph.