First of all you want to select the Image button (Open Manager)
A window will open up, where you can select "Add Image"
Select the image that you wish to upload and click Open
Click "Start Upload" and you will be prompted once the upload has finished.
If you wish to insert the image you just uploaded, click "Insert" Otherwise, click "Upload Image" to upload another.
At any time, you can view and re-use all the images you have uploaded by selecting the "Browse Images" tab.
These Image libraries are personal and only you can view them.
Enjoy the new method of Images!
If you log into a different Forum account, the images from the last account will load.
To fix this, you will have to do a hard reload (Ctrl+F5 on windows, Cmd+F5 on Mac)