User Portlet User Portlet

Discussions
*Vitaliy Kaurov suggested that I cross post this [StackExchange original][1] here.* I am trying out Mathematica as a prototyping tool. As an initial exercise I have put together a brute force ray tracer, with a view to using Mathematica's built...
I can upload my .m scripts to the Cloud and they are recognised (colour formatting), but I can't seem to run them interactively. What am I missing?
Very pleased that I can get the cloud up on my iPad, but I can't seem to get it to recognise Shift+Enter for evaluation. Am I missing something?