Portfolios are all of the work you have submitted through the Publishing Center. You can see that in the top black bar next to Notifications.
There are also profiles which you can edit by clicking the settings icon in the tabs between the house and the trophie. If you click around in there you will find a lot of nice features to fiddle with including signatures for board posts like these, backgrounds for your profile, and info on your profile. You can also edit your about page there!
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