Log in to MyAccount at www.globe.com.ph/myaccount.
From the Account List page, select your Postpaid account and then click on the "Manage Account" button.
That takes you to your Account Dashboard. Scroll down slightly and you'll come across the yellow portion (highlighted below).
This shows you the total amount of reward points you've earned. Below your points count is a link that says "Click here to manage your rewards." Clicking this will take you to the online store, where you can use your earned points to redeem reward items.