adding newly installed apps as complications on watch faces

watchOS & Apple Watch Apps

I recently purchased an Apple Watch, but am having a bit of an issue with it. I wanted to add installed apps that I have installed from the app store, like weather conditions that I believe Thomas had installed, I assume from weather plus.

However, I only see the 16 default apps and none of the apps I have installed from the app store show up in the complications list. I checked, and all of them that I wanted have show in Apple Watch enabled. Am I missing something here?