Information about registration — everything from adding and dropping classes, taking classes for CR/NC rather than a letter grade, transferring credits, requesting transcripts. etc. — is provided by the Registrar's office. You'll find answers to many of your questions in the Academic Policies section of the College Catalog, with many of these repeated on the Registrar's website.
If, after consulting these sources and not finding the answers to your questions, we encourage you to contact their office directly for assistance, at email@example.com, or 240-895-4336.