Hi K A,
I have a question for you, why don't you search the OutSystems documentation or training material for this. You will find the answers there easily and faster than posting on the forum. The answer to your question can be fond in second browsing the internet or the Outystems documentation.
I see this is becoming a trend now to ask "Please tell me how to use x".
OutSystems has great documentation and training material, which is something someone new to OutSystems should read through to get a better basic understanding of how to develop applications with OutSystems.
Regards,
Daniel