It's the rear wall inside the freezer, there is no access from the outside and rear of the freezer.
The drain trough is right under the coil and the drain line is right in the middle or close to it at the lowest point.
I use a small hammer and just tap the ice and break it up into chunks.
Then very hot water to thaw and clear the drain out.
I then bend the heating element or wrap a small metal wire around the heater and hang down inside the drain to keep it from freezing up again.
Most of the time I just bend the element down towards the drain and that works the best.
Using something like a coat hanger and wrapping around the element works good too
Item 7 is the drain trough the diagram doesn't show were it is at but it sits right under the coil
I think there is a problem with chat, I am going to switch to the Q and A format. If you need further assistance please just let me know. Thank you.