If you have started a new blog or are switching to Ghost from a different platform, you might ask the question, "What is the URL to login?".
The way to log into the admin section of your blog is to just add /ghost to the end of your blog's URL. For example:
www.your-site.com/ghost
If you host your blog in a subdirectory like /blog/ then just add the /ghost to the end of that:
www.your-site.com/blog/ghost
Same for a subdomain:
www.blog.your-site.com/ghost
If you are used to using a service like Wordpress or something else, Ghost does automatically redirect /admin and /wp-admin to /ghost to allow you to login rather than just 404'ing.
Once you go to /ghost and login, you will be inside the Ghost admin section and can write new posts or make any adjustments that you need.