Lets say I am working on a project with 2 other people and there is some information that I need to work, so Can I ask like this:
Can you please tell me "How am I supposed to run this script?".
instead of
Can you please tell me "How do I run this script?".
What I am trying to ask is whether replacing do with supposed to makes the question rude?
Because usually it is used in a expression like this:
How am I supposed to know you don't like something
Best Answer
I'm not quite sure why OP is asking, since he seems to know the answer anyway.
You don't normally ask How am I supposed to do X? in a genuine spirit of enquiry, because it's pretty much the direct equivalent of How do you expect me to do X?. These forms are invariably used in hostile/beligerent/uncooperative contexts.
OP's How do/can I do X? is the "standard" form, but if you want to be a bit more deferential/polite, you can always ask How should I do X?