(header text style change but failed and messed up everything) need help?

[ABISSTOR]

abisstor.myshopify.com

check to get it back to the previous way 

i tried to edit again in theme but this pop up shows and website i need help 

[Morek]

Hello ABISSTOR,

You have this error because your theme has an error under assets/vela-site.scss.liquid. What do have when you try to click on "Open Code Editor"? I can help you fix this. Just try to open the code editor and tell me what you see.