On the main menu of the app, you have an icon with a rocket, when you click on it you have access to more or less 120 cryptos currencies that we have for the moment.
Many more cryptos will be listed after. You can click on a crypto and click on buy, after that you can write the amount in EUR that you want to invest on this crypto, with the crypto price and the estimated fees. After you have written the amount, you can click on buy. You should see the crypto amount on the main menu "All accounts". You will be able to exchange cryptos from this menu.