JSE tokens can be stored either on the platform or exported via an ERC20 token which is compatible with 3rd party wallets and exchanges. For most users we recommend keeping the tokens on the platform as once they are exported we have no control over fraud/theft/hack attempts which may cause loss of funds.
Tokens stored on the platform are still only as secure as your password credentials and operating system security so please take care to use unique, secure passwords and ensure that your operating systems is free from viruses and trojans.