Welcome to TBT! I hope you enjoy your time here!
Info on seashells and TBT bells can be found
here and
here, but to give you a brief rundown, seashells can be used to change your username, your user title colour (your user title is the text underneath your username; yours is currently "junior member"), and unlock the ability to have animated avatars! You can find and purchase any of these add-ons in the
shop! These add-ons are also purchasable with TBT bells.
TBT bells are primarily earned by posting on the forums! The longer your posts are, the more bells you'll earn, but you
won't earn any bells for posts made in the Introduction Board, TBT Marketplace, The Museum Shop, The Basement, and certain Brewster's Cafe threads. There's also currently a Birthday Bell Bonus available until December 31st where members can earn an extra 10 bells per day by making a post in an eligible board! You can find more info about that
here.
I hope that clarifies things at least a little bit! If you have any more questions, please don't hesitate to ask!