How I make my client login to their website I don't understand

Hello Solcire,

It is not possible to add more users to Nicepage, because one subscription is intended for one person. However, with Pro or Ultimate, you can add Client licenses where the users will be able to edit Joomla and WordPress pages.
Please refer to this page for more details: https://nicepage.com/doc/25536/client-licenses
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Sincerely,
George.
Nicepage Support Team

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You can only invite other users if you have a Wordpress or Joomla website and use Nicepage as your page builder. If you work with Nicepage Desktop or Nicepage online, you must share your own access data. This is not recommended, if you want to work with multiple users, I would switch to Wordpress or Joomla. You can add customer licenses for your co-workers here: https://nicepage.com/User/Orders/Subscriptions