Hello Corinne2
If you mean the SwissPass Card, this is sent automatically every 5 years if you have active subscriptions. Alternatively, you can order it from this link or pick it up at the counter when you are in Switzerland: Travelcard dates | SBB
If, on the other hand, you mean a public transport travelcard, you can usually renew it from your account on swisspass.ch.
For further questions or help, I suggest you contact us at the following number: +41 0848 44 66 88
Kind regards,
Chiara_S