The blog is only avaible to e-members and full members, and NOT too members that are simply registered!
To post a new entry, you have to be logged in. If you are logged in and you are a registered member, you can click on the BLOG tab in the top menu. After this should open up the blog page with the following controls:
On the right hand side, you'll see there is a little white page icon with a green cross on it. Click on that if you want to create a new entry.
Now you can type in a name for your blog and add some text. On the right, you'll see a control for "Images and Documents".
Click on that if you want to add a photo. Then goto the "Upload" tab next to the "browse" one, select a photo on your computer and click "Upload".
If the file is not too large (in MB or in pixels), then a notification should appear saying "File uploaded successfully", and the image will be inserted into the blog article automatically. Othe