The Test Runner is where you do the test. It works on a computer and in a phone's browser, so you can take it out on site.
Steps
Open the test: Test Runner from its card's panel, or Test it on the control.
Work through the checks. Each answer is saved as you give it, so you can stop and come back.
Add photos or files to any check: Add, or Add from phone. See Adding photos from your phone.
Watch the suggested % against the pass and fail lines as you go.
When you've finished, go to Complete a test.
Layout
The page picks a desktop or phone layout by screen size. Use the switch at the top to change it.
Can't do it today?
Use Couldn't test. See When you can't test.
Who can answer
Answering checks needs your workflow role to allow it at the test's current stage.