1. Click the Setup gear icon in the upper right-hand corner of the screen.
2. Select Setup from the dropdown menu.
3. Navigate to User Interface in the left configuration menu.
4. Select Lightning App Builder.
5. Click Edit on the homepage you want to assign.
6. Click the Activation button.
7. Select Assign this Home page to specific profiles.
8. Choose the profile you want to assign to the homepage.
9. Click Next, then click Activate from the Paged Saved dialog.
10. Select Save to save your changes.