You'll find information on the possible consequences of plagiarism under the section on Academic Integrity & Academic Honesty.
The short videos on this page from Rutgers University Libraries are funny, but very informative. If you have any question about when you need to cite sources, please watch them!
One of the videos suggests creating footnotes. This is not necessary. See the information on creating in text citations under the APA Format tab.
For further information on plagiarism and guidance on when you need to cite a source, see The OWL at Purdue's guide.