Hi,
I have tried to edit the codes in function.php. The website works perfectly fine after updating on the new codes and also works even after deleting the updated codes. However, when I update again without doing anything (no new codes added or deleting any), the website is down. I cant access both the website and wordpress now.
I did installed a new plugin way before updating the codes. Does this effect the whole thing?
I need to solve this quickly 
Please advise, thank you.