Test steps make the test case. They can be commands, assertions and references. There are different collections of commands and assertions for page and for a target (DOM element).
If you want provide an action with a comment while editing it you click on "comment" link.
The comment form expands and you can type in your comment.
As you save the changes the comment appears in the test case table.
Comment in the test case table
"Wait for the target" Option
While editing any target action (except target.assertVisible) you can use "wait for the target" checkbox to specify if the system needs to wait for target to appear in the page DOM before performing the action
Wait for target option
As you save the changes with the option set ON the test case table you can see updated action description.