Context menuUser Properties 

To open this dialog, right-click the diagram or model element in the Model View or Diagram View, and choose User Properties on the context menu. 

This dialog box is used for creating user properties and OCL constraints. The dialog box displays a list of properties, if any, each entry consisting of a pair Name-Value. 

You can add and delete entries, and edit names and values. For editing names, use the Name text field. For editing values, you can either use the text field, or click the button and enter the text in the editor widow.