There is a video that walks through the item types on the website. Here is a link…
There is also a sample checklist with all of the items in it and examples…
Search for Form Item Examples from the Search panel.
To add them in the editor it is pretty straightforward. After adding a Check item, on the right you selected the Item Type you want. Each item type may have some specific parameters to fill in.
Here is another post that talks about Linking with Form Items…