In order to create a blog post from the front end you must first be a registered user. Once you've become a registered user and have logged in you will find a few more items in the top menu. Click on 'Account' which will bring up a new menu with the option to 'Submit Post'. Just click on that to bring up the new post form. Try to use a 'Featured Image' with your post, it just looks better when viewed in the blog. The 'Insert Image' button is for inserting images in the message body itself. Those items with a red asterisk are required. Once you are finished filling out the form simply press the 'Submit' button. That's all there is to it. Pretty simple. Enjoy!