Hyperlinks are implemented using stereotypes and tag values. The HyperlinkOwner stereotype has the following its properties (tags):
You can use generic profiling API to edit/add/remove hyperlinks to model elements. See Working with stereotypes and tagged values for more details.
Recommended way is to use utility class com.nomagic.magicdraw.hyperlinks.HyperlinkUtils. This class provides utility methods for adding/removing/retrieving com.nomagic.magicdraw.hyperlinks.Hyperlink from model Element,