How do I access the context menu of IVIEWER an Android app?

I am using an Android app called iViewer on Nebula 10" and 21". I managed to install it but I can't access the iViewer setting/context menu to set its GUI options. I need to access the GUI options to let it know where to load the code. In previous Nebula version, I can access these options by bringing up the context menu. May I know how do I do that in this version of Nebula 10" or 21"?

Solution The iviewer has conflict with StarOS, you need to revert back Android default launcher (remove Staros launcher) by USB update the firmware! Please contact our sales for firmware of your tablet to update.
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