The Cosmic Symbols card lets you access the hidden panel on the town fountain. Pressing the three symbols (and the center Sun) will open the plaque.
The only "card holder" on Poptropica is for the Cosmic Symbols password on Astro Knights island. Th girl with the card is upstairs in the Mill.
You need the Princess's secret message from the maid's room (castle first floor left).
Click on his card in your items bag.
You get the Cosmic Symbols card from the girl in the mill (second floor). You will need the Secret Message from the Princess (found in the maid's room in the castle). (see related question)
To obtain the password card on Astro Knights, you must first retrieve the book in the secret library. After reading the book, you will be able to figure out the code to unlock the password card from the barrel in the windmill.
The Cosmic Symbols password card lets you enter the room under the fountain in the village. Pressing the three symbols (and the sun) on the fountain plaque will open the secret door.
it does not say library card you have to click McM because that what it says on the library card again not library card
The password card (Cosmic Symbols) is from the girl in the upper room of the mill. You will need to have the Secret Message from the Princess (it's in the maid's room of the castle, first floor left). Pressing the three symbols, and the center sun, will open the panel under the village fountain.
You need the "secret message" from the maid's room (castle first floor left), so that the girl will give you the Cosmic Symbols password card. (see related question)
Get the password card (Cosmic Symbols) from the goth girl in the second floor loft of the Mill. You will need the Secret Message from the Maid's room in the castle (first floor left). Press the three symbols, and the sun, on the plaque on the village fountain.
Take the secret message (from the maid's room in the castle) to the Mill. Up inside the loft is a mysterious girl who will give you the new password for the secret society.(Go to the fountain, press the three symbols and the Sun.)
You go to Mordred's Museum and click the books on the top floor. The manager won't let you have the books, but you get the card.