In the dApp, click on your name in the top right corner to open up your Wallet. Select the button that says Switch, which will take you to the page to manage your Wallets. You can switch between the CryptoComics Wallet and Browser Wallet at any time.
NOTE: Your purchased items will be stored in the Wallet selected at the time of purchase. You can send items to other Wallets at your discretion. All items in your account's connected Wallet(s) will be available to read in your collection in CryptoComics.