Replacing magnepan binding post


Somehow the post into which you insert the speaker wire broke off. Mag sent replacements but for the life of me I can’t figure out how to remove the back plate to get access. Would anyone know how to do this? 
novatt
If the terminal plate is the original: there should be screws in the terminal plate's four corners.       If not: color me baffled!       Sorry I couldn't be of more help.
Thanks. It’s all original but there aren’t screws anywhere that I can see. Thanks for trying! I’ll try to get thru to magnepan which isn’t easy