Update README.md

README.md

@@ -5,7 +5,7 @@ DF-BPMN is based on the [Eclipse Graphical Language Server Platform (GLSP)](http
 
 [*DataFlow BPMN techninal report (how to use DF-BPMN)*](https://drive.google.com/file/d/1OlyvdmG6lZWu_PqOhf6OgEkZ6cwT6RPa/view?usp=sharing)
 
-<h2 align="center"><a href="https://noureldin-ali.github.io/open-bpmn/tutorial/" target="_blank">Start tutorial</a></h2>
+<h2 align="center"><a href="https://noureldin-ali.github.io/df-bpmn/tutorial/" target="_blank">Start tutorial</a></h2>
 
 <h2 align="center"><a href="http://172.171.161.217:3000/#/usr/src/app/workspace" target="_blank">Start the Online Demo</a></h2>