Change column type to string

I am working on a UML 2.0 Relational Diagram for a Java project I am working on for school. I need to add three columns to one Entity but I need the type to be string. I don’t see that as an option though. Is there a way to set the type to string??? Do I have to chaose a different type of diagram to get this as an option, or does it not exist in Visual Paradigm.