From a computer, please log in to your Paymium account and click on 'Swap'.
Then, in the top drop-down bar, please select 'ETH/altcoin' of your choice and fill in the proposed amount.
Finally, select 'Euro' from the bottom drop-down bar and confirm your sale.
From the mobile application, please log in to your account and once on the homepage, click on 'Sell'.
Next, select the crypto-currency of your choice, enter the amount of the crypto-currency and it will display an estimated amount in Euros. Finally, click on 'Sell'.