For Windows Integrated Auth to SQL Server, you’d change the “Log On As” account for each of the Server services in the Windows Services applet.
The account you use should be a member of the local Administrators group on the server, and you’ll need to change and restart each of the services (BESRootServer, FillDB, GatherDB, Web Reports, and WebUI), assuming you also want to use AD service accounts for Web Reports and WebUI