It's at the following url: https://www.outlook.com/. If you're logged into Outlook, doing so will take you to your inbox.

If you aren't logged into Outlook, first enter your Outlook email address and password.
You cannot mark emails as spam on the Outlook mobile app.
 This will select the email.

Repeat this process for all emails in your inbox that you consider spam.
 It's an option at the top of your inbox. Doing so will mark the selected email(s) as spam and move all selected items into the "Junk" folder., You'll find it on the left side of the page., This button is at the top of the "Junk" folder., Doing so deletes all mail that's in the "Junk" folder.
Go to the Outlook website.
Click the box to the left of a spam email.
Click Junk.
Click the Junk folder.
Click Empty folder.
Click OK when prompted.
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