RevolverC

Hello, I'm by no means a professional at this type of script, I'm trying to teach myself Tweening to better my live-stream. That being said, I wanted to add a green pulse effect to one of my notifications when they appear, however I've tried and read everything and I can't seem to either: A ) Get the correct format of the code? B ) I'm not sure where I should write or put the code. If anyone could be of some help I would really appreciate it. I've been reading these articles all day and I can't seem to come up with the answer. Thank you in advance - RevolverC