Stamping Money

Hi, I'm new to the site and I am wondering if we are supposed to stamp the bills? thanks!!

If you find a bill that is marked or stamped with a money tracking website you enter it at the site. If you want to participate in the activity of money tracking then you can write or stamp the website name on the note and enter it on the site. Hopefully someone will find and enter the note in short order giving you a hit. Mark and enter any notes (bills) that you receive during the course of day and "track" where your money goes.

If uncertain, check out this from the FAQs:

Marking money