GNS3 graphical features are limited and the workspace was designed primarily for depicting images of devices and the links between them. However, there are some basic annotation tools on the Annotate menu. These are Add Note, Insert picture, Draw rectangle, and Draw ellipse. However, there are a couple of tricks that are worth knowing about that will give you a little less frustration at the limitation of these simple functions:
Rotation of shapes: When you add a shape (not a picture) you can use the <Alt> + p and <Alt> + m or <Alt> + <minus> and <Alt> + <plus> keys to rotate a shape around its original top right-hand corner. In the case of a Text object, you must have your cursor positioned in the text box for this function to work.
Alternatively, you can right-click on the object and select Style, and enter a numeric value in the Rotation: field. This is often the easiest way to reset the shape to its...