Adding stereotypes to elements

There are two ways to add stereotypes to elements:

Using the "Add stereotype(s)…" command from the context menu of the selected element.
In the Properties or Element view on the selected element.

Adding a stereotype to a class in the "Element" view

Steps:

Select the element you want to add a stereotype to.
In the "Element" view, select the "Extensions" view.
Click on the "Add stereotype(s)…" button.
Select the stereotype of your choice from the list.
Click OK.