About the problem –
This might be happening because you haven’t set the category to any of the portfolio items. Please set a category to the portfolio items and you will not see those warnings. Thanks.
To edit project details, click on the “Portfolio” section in the dashboard and choose the project to edit.
You can change the footer text (Powered by WordPress etc) by going to the “Appearance > Theme Options > Footer” and insert your text into the Footer Insert textbox.