Please have a look at this discussion - Backtesting 5 Ema Strategy of Power of stocks
A similar kind of strategy has been created and shared in the above link. You can copy the strategy into your account and make changes to it as per your requirement.
If you want to check your conditions on the Nifty bank’s charts, simply mention the conditions inside the Symbol function and this shall work fine. Refer to the link to learn about the Symbol function - Create (Advanced) - Streak Help
Hope this helps.