You can trade crypto on any cryptocurrency exchange platform. Use the above comparison tool to choose an exchange that fits your needs. You can filter results by coins offered, account funding options, withdrawals and other features. To sign up, select your desired platform and follow the prompts. Many cryptocurrencies are only available in trading pairs, which means certain cryptos can only be traded for each other. Enusre that you have the appropriate cryptocurrency on hand for nature of your trade. Information on trading pairs is available on the platform.