Hi Laleh,
the method is in the database already, but it is very simple; there is no need to buy an additional method. Can you post a picture about the 0 impacts? Which database version are you using?
Thank you,
Andreas
edit to reflect your second answer below: I guess you are looking at the raw value version of the database? This does not contain the method, the method is on the worker hour version. You can export it (as JSON-LD) if you want. A process will not have direct social impacts if it does not have any indicators (to your second question again).