A blog is a web site, where you write stuff on an ongoing basis. New stuff shows up at the top, so your visitors can read what's new. Then they comment on it. Or not.
Your blog is hosted and promoted by GhanaWeb. You decide yourself what to put on your blog. It can a story or a photo or both. If people like your stuff you will get many visitors.
You need to register yourself before you can start your blog.
Registration is free and only involves giving your email address which will be used to send a password to you.
Once you have your password you can start your blog.