How to make trail glow through shaders?

so im really new to this and what i want is to add shader to trails material and change its color mode to hdr so i can buff intensity and it will glow but it doesnt work like that:
even if i change the color through actually doesnt change anything and stays the same color i chose in inspector for the trail so again nothing happens

im pretty sure im doing something wrong but what exactly and how to do it correctly?

aight i actually managed to solve it by myself, i forgot to save asset that was the problem why i didnt see any result lol, also i multiplied the color i want with white hdr +1 intensity and now it actually works