Welcome to geocaching Mike! I'm sure there is a FAQ on travel bugs, but I know that it can be confusing at first... geocachings, geocoins, travel bugs, pathtags, oh my!
Once you use the activation code to 'turn on' your travel bug (TB), you be giving a number that you can use to reference it in public. You can think of this as its public name. You can share it, write about to others, blog it, whatever. If someone wants to do a search on-line or on geocaching.com to find out about it... its reference name is what they can us.
The number printed on the coin is its private name or tracking number. You should never post a message with this number, take pictures of that number and post it, etc. because knowledge of this number is evidence that you have actually had the object in your name in 'real life' (RL). To add a log on geocaching.co. (GC.com) that you 'discovered', picked up, or dropped off this coin, you have to supply this number.
You'll see in time, all trackables (TBs and Geocoins) have a reference number and a tracking number.
I hope that helps, you take care, and welcome to the game!
- Savoy
but why cant you use the tracking number on the bug that you already have to talk about in public?
Thanks for the help!
Savoy's typo may have misled you. To have the number from the coin or tag means that you have actually laid eyes or hands on said coin or tag in real life. With this number, you may then discover it, or grab it and add it to your inventory. Whether you have it or not.
Just to be safe, only use the ref # when you talk or write about it. Forget the private number, until of course you find it again.
I'm new too, so hopefully this helps.