I used computer one to generate a blog, and deployed it on my github repository, can I post a new article with another computer? It seems that cloning the repository didn't work cause the blog need hexo to generate.
You probably need to setup travis ci build to generate the blog. Your github repository will containt sources (not the generated output) and trivis ci will run hexo on every commit and push artifacts to github-pages brabch. With this process it will be possible to just push new page source to primary branch (from any computer) and travis will automatically regenerate and deploy.