On mobile we recommend installing Coinbase Wallet. Please check out one of our Medium articles for a list of all the browsers and extensions that we recommend on both mobile as well as desktop. On desktop you can use MetaMask, an in-browser ETH wallet created to allow apps like Cent to exist in mainstream browsers.
Note: Whatever wallet you use make sure you don’t forget your password or the seed phrase.
Here's a helpful video for installing and setting up MetaMask.
If you're wondering why you need an Ethereum address, click here.