To change the language in PowerPoint:

1. Open PowerPoint and click on the gear-shaped icon in the top right corner.
2. Click on ‘Options’ in the drop-down menu.
3. Navigate to the ‘Language’ tab on the left side of the window.
4. Under ‘Choose Editing Languages’, click on the down arrow.
5. Select ‘Add Additional Editing Language’ and choose your desired language from the drop-down list.