Ordinary Gweilo

The instructions are in English.

But the touchscreen isn’t.

So, that icon on the ‘pick up procedure’ with an arrow pointing up…

This one:

Don’t see anything like on the touchscreen.

Gotta be the green one with an arrow pointing up?

No.

It’s the orange one with an arrow pointing down.

Now, yes, since you mention it, the Chinese characters 取件 do appear in the instructions and on that orange button.  So if you can recognize Chinese you can get this far.

There are, of course, more screens to navigate – all of them in Chinese.  Trial and error seems to work.  Eventually.