Navigate to your custom list

Click on Automate in the Task Bar

Select Power Automate from the dropdown list.

From the submenu click Create a Flow.

The Create a Flow panel will open on the right of the browser window.

From the list, select a template of the type of Flow you wish to create.

For a greater range of templates select Show More below the template list.

A screen appears listing the apps involved in the flow and the accounts used.

To change the app access account click on the ellipsis (...) next to the credentials,

Select an alternative account from the dropdown list.

Click Continue.

Edit the flow as required. Once you have completed the flow, click Save at the top of the window