As seen in the screenshot you are in Modeler perspective
Click on Administration Control tab on the top to go into Administration Perspective and then ADD HANA SYSTEM :
For adding HANA System just follow this document:
http://scn.sap.com/docs/DOC-25922
For this you just need Your HANA Server hostname or IP address and Instance Number
Then you will have to provide your User ID and Password
After that you can start playing with your HANA System 