Log in to MyAccount at accounts.globe.com.ph
From the Account List page, select your Postpaid account and then click on the "Manage Account" button.
That takes you to your Account Dashboard. Click the "Increase/Decrease my credit limit" button in the "I WANT TO…" section of the page.
Fill-out the required fields and upload your proof of financial capacity document. Don't forget that the file should not exceed 5MB. Once completed, click "Send".