ERPNext Currency Symbol

Hi,
First, I’m not a devoloper I just trying something for hobby. I want to change currency symbol but I couldn’t. I read 4 5 solutions but I didn’t understand.
Example:
if select turkish symbol from Currency select box. I write TL next to Total Amaount. if select usd symbol from Currency select box. I write USD next to Total Amaount. But i can not change currency symbol. Can you help me about this?