The radiator is leaking from a "seal" from the top of the radiator

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If you are standing facing the car, we detected the leak is coming from the radiator tp left. it looks as if there is a "seal" and a screw to hold it in place. This is where it is leaking from. we attempted to patch it as well as putting Bars Stop Leak in the system. This was effective for about 2 days with no leaks as it started leaking again. PLEASE HELP with possibly diagnosing this issue as i am not able to send the car to a shop at this time. All your feedback is greatly appreciated and thank you in advance