You can store Ethos tokens the following ways:
While we do not advise storing coins on exchanges, but if you do, make sure to have a strong and complex password. And always have 2FA enabled!
Which you can find here. Always make sure you're on the right site and not a phishing site!
Nano, Ledger and Trezor
Ethos Universal Wallet
Soon you are be able to store all ERC20 tokens on the Ethos Universal Wallet. Keep in mind that the coins must meet BIP32 standard and pass a vetting process to be officially listed in the wallet. Check all BIP32 coins here.