How do I create an error exit on my activity?

Probaby a pretty basic question, but I wonder how I create an error exit on my activity like shown in this picture (and I mean the read circle with the white X). It is completely eluding me in the modeler interface (I use version 6.10.3)  
1 answers

You can right click a microflow action and select error handling options. When you select a custom option you can add another microflow 'path' to the action. Then you'll need to select that 'path' and click the option 'Set as error handler'.