Citations and quotes are handled by Check For Plag by identifying and removing them from its plagiarism analysis. In most cases, the software will recognize and isolate any quoted text or correctly credited sources when you submit a document for verification. Because these passages are seen as acceptable uses of other people's work, they avoid being reported as plagiarized.
When using quotes or paraphrased text in your writing, make sure to cite sources correctly (APA, MLA, Chicago, etc.) to guarantee accurate results. This will make it easier for Check For Plag to identify and remove certain portions from its examination.