When writing a post you have to enter a title and hereafter you are free to let your thoughts flow in the POST-section. For formatting your post there are some buttons like the ones you know from your favourite word-processing-programm like MS Word©.

Next to Add Media you will find the icon for adding an image:

By clicking this a dialogue box will popup where you can choose a picture to upload and give a few options like alignment and size to it.

When you finished uploading and settings simply click INSERT INTO POST and voilá, here we go!