In the tab ‘Account’ are the details for your own user account.
To import the data in Power BI you need a Connector Key (read Usage Connector). With the button ‘Generate key’ you generate a new connector key. With the button ‘Copy to clipboard’ you copy the key in the memory to paste it later on in Power BI.
The connector key is only visible when you are generating it, it can not be displayed at a later moment. This is why you should keep the key in a safe place. It is possible to generate a new connector key later on. When you generate a new connector key, you have to replace the old key in all Power BI reports where it is in use.