For the time being you can't send money to people who aren't registered with Wero. If some of your contacts don't yet have Wero, why not invite them?
For La Banque Postale & Postbank customers, registration takes place in the Wero App (available in the Play Store or App Store). For customers of other banks which have integrated Wero, registration takes place in their banking application. For more information on Wero-compatible banks, click here: https://start.wero-wallet.eu/