Upon graduating from college and receiving a degree in their desired field, many people choose to sign their names with the addition of their degree included at the end of their name. For example, doctors typically sign "M.D." or "Ph.D." after their names, depending on what kind of doctorate they have attained. For someone with a Bachelor of Science degree, it is more uncommon to include it after signing your name, however, it is done.
Sign your full name.
Sign "B.Sc." or "B.S." at the end of your name, after a comma. Both designations are used and both are correct.
Include the title of your degree if you wish. If you are writing a scholarly paper that will be published, you might want to include the type of B.S. degree you have, especially if it is directly relevant to the topic you are writing about. This will verify your expertise in the subject. For example, if you are publishing a paper relevant to the field of criminal justice, you may wish to sign your name with a "B.S., Criminal Justice" at the end.