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Cageym,
When you click on "My Account" there's a picture of my card in the first column on the left, with a number of options underneath.
There's a link that says "View Current APR". Right under that is a "More Account Options" link. Click on the "More Account Options" link and there will be a pop up.
In the pop up, the 2nd column is "Account Management" and the last option in that column is "Increase Line of Credit".
Good luck!