For each company, you will have to create a separate account with a different email address. The same applies for trade names. Your email address is also your username, and an username can only be related to one account.
You can create a new account here: https://www.isolta.com/start-invoicing/, the same way you created your previous account.
Remember, when creating a new account, log out from the old one. Otherwise the activation link will direct you to the old account. This applies to every time you want to log in to a different account. You have to log out in order to log in to the other account.
If you want to use Finago Isolta simultaneously, then you have to open them in different browsers.
If you have another company and you are using Finago Isolta, we offer a 25% discount for first year to the second company. The discount only applies if you already have a paid subscription for the first company. The second account is free for a company that has the same business ID as the one that you have subscribed to (ordered a paid version).
To use this offer, please contact our customer support before placing your order so we can add the necessary discount.