Samsung Smart TV Integration Configuration

Hi All,
I got the Samsung Smart TV Integration working partially, it can turn on my TV. But it cannot switch to HDMI 2 and I think that’s because I don’t have the API key for SmartThings configured yet. (It doesn’t seem to need the SmartThings Integration itself, it uses an API personal access token you generate from the Smart Things site)

But in reading the documentation, I didn’t see the step to enter my API key when setting this up. And I’m wondering did the UI change? Is there another way to access that?

Here’s the main doc and also the Smart Things specific doc which is brief:

I’m working on the coolest automation which is 90% there, involving a bike trainer, PC, and turning on the TV and setting it to HDMI2.

Appreciate any help, thank you!