How do I insert a block into a node? I can't insert a block into an article on Drupal 8. 

I installed the module, created a custom block, created an article using the Full HTML input format, inserted [block:block=1] into the article body, and saved it.
Nothing happened. [block:block=1] appears in the text instead of the desired block. I tried to find something in admin/config/content/formats/manage/full_html to make Drupal recognize the inserted blocks, but I found nothing.

Am I doing something wrong?
The insert block module implements an "input filter" via the core Filter module. A text format is a collection of enabled input filters. So when enabling a module that provides an input filter, the next step would be to configure the text format to use the input filter.

The Full HTML text format does not have that input filter enabled by default.

In addition the module has a Drupal 8 development release, but the code underneath still seems to use PSR-0 for its class loading and has not been updated in 3 years. It may be broken for other reasons as well.