thank you !!!
it's my fault, it's used the Cosmo theme which is already minified on the Bootstrap CDN site:
now I change to NodeBB Vanilla and the font will not be load .
Plez tell me about ads how to do it . How to get ads on my nodebb forum
Use this plugin :
https://github.com/NodeBB-Community/nodebb-plugin-adsense
Thanks a lot , let me try that