Help With Oil Filled Heater

Hi, I’m not sure if I am in the correct forum but I will post this question with hope someone can help me or point me in the right direction. I have a Garrison oil filled heater the same as seen in this link.

My question is how to remove the front panel to access the wiring to attempt to fix the knob that turns the unit on. There are 2 screws in the bottom of the heater & I have removed however the panel is still connected somehow on the top & there are n visible screws to remove. Does anyone have any idea how to remove the panel? Thank You

Heaters such as you have shown typically have NO user serviceable parts. Return to Garrison for warranty/repair, or discard and replace, as they are intended to be disposable units anyway.