how can I configure some settings, from nerd commenter (lazyvim)

Question

I am a new user of neovim, and I install the plugin nerd commenter. I am using lazy vim and need to add this config: let g:NERDCustomDelimiters = { 'gdscript': { 'left': '#', 'leftAlt': '', 'rightAlt': '', 'right': '' } }

but i dont know where, this is my nvim dir:

nvim dir

I already tried to put it in the init.lua file, but I found some errors