The default state of online forms vary and is sometimes unpredictable. Because of this, if instructions say to check/select/click on a box, but the box is already selected, continue with the test without changing the state of the box (i.e. assume that the test author wants the box to be checked before moving on with the test flow). Leave a note to the test author via "suggest improvement" (choose "The action you want me to do is not fully described" and add a comment like the following: "the box was already checked so I didn't uncheck it. It will be very helpful to mention in the instructions how you'd like testers to address this situation in the future). That being said, if the instructions specifically mention to "select or check a checkbox (whether it's already checked or not)", then follow the instructions and change the state of the box.
Apply the same rule if the instructions tell you to uncheck/unselect a box, but it is already unchecked/unselected.
Manually type vs. copy paste:
When the test author instructs testers to type something, testers may use copy and paste to achieve this goal. However, keep in mind that this is the tester’s responsibility to double check that everything was pasted correctly, and that no character was dropped (which may happen depending on connectivity, VM load, and others).
If the instructions specifically say “type (do not paste)” then you must follow the instructions and type everything without using copy/paste.
Wiki Page: Rule 1 Supporting Examples · rainforestapp/tester-chrome-extension Wiki · GitHub