Once you have logged into the service, you can select your organization from the All subject areas menu.
Has your organization defined training for you to complete? First, make sure you are logged in to the service. More detailed instructions for logging in here:
How do I sign in with a Microsoft account?
How do I log in with my username?
After logging in, you can view trainings. The trainings of your own organization are visible on the home page under the title Your organization's own content. You can also find your organization in the All subject areas menu on the top bar of the page.
If a study plan has been defined for you to study, you can open these from the Study plans page, which you can find in the menu in the upper right corner of the page. You can recognize the study plans shared for you by the person symbol.