At first go to menu in admin panel: posts> Add New
The Add title for your post in Title bar, Add Post content in the text editor.
Add category from Categories in the right menu.
Wanna add tag? You can find that too in the right menu.
Bottom of that, lets have a look at the feature Image. Thats the image which will be shown in the blog page.
Add it. Wanna Change it ? click on the Remove Feature Image. The add New.
At last press publish, the blue button in the top right in the right side menu.
Thats great. You have created your first blog post. You can find it in www.photo4life/blog