At this time, Microsoft does not currently maintain a version of Power BI that will function on macOS. If you only have access to a Mac computer, potential solutions include installing a virtual machine, using Boot Camp, or remotely connecting to a Windows computer.
Before pursuing any of these options, we recommend that you consult with a member of your information technology team to ensure that you follow your organization's policies.
Virtual Machine
Virtualization tools such as Parallels and Virtual Box allow you to install Windows in a contained environment.
Boot Camp
Boot Camp Assistant is a tool for creating a separate Windows partition on your hard drive. For more information, see Apple's Boot Camp Article.
Remote Desktop
Your organization may have Windows computers or Virtual Windows machines you can connect remotely from your Mac computer. Usually, a tool such as Remote Desktop Client is used to connect remotely.