To do this:

1. Log in to the Outlook on the Web in your browser: https://outlook.office.com
2. Click the gear icon in the upper right corner
3. Click on "Rules", in the middle column of the Settings window
4. Click "Add new rule"
5. Set a name for the rule that will help you identify it
6. Use the drop-down menu to add a condition to trigger the rule
7. Use the drop-down menu to add an action for what you want to happen when the rule is triggered
8. Click "Save"

To modify an existing inbox rule, follow steps 1-4 above, then click on the pencil icon in the row for the rule you want to modify.

To delete an existing inbox rule, follow steps 1-4 above, then click on the trash icon in the row for the rule you want to delete.