This is pretty easy. Just reply to this email and put your notes about each check-in *below* that venue's name.
Leaving some blank is fine.
You can visit http://lastnightscheckins.com/notes to see your notes later on.
++ Nov 25, 10:09 PM @ Boulevard Bar & Grill (dNY3142) ++
++ Nov 25, 09:50 PM @ Grandview at Las Vegas (x2R3090) ++
-*-*- end email -*-*-
Don't forget: http://lastnightscheckins.com/maps/25490185246 has a map of all your check-ins to date!