In the review forum (see Access Review Forum), click the "Me" Tab, which contains the review questionnaire.
Fill in all the different questions, then click "Submit my report". Please be aware that you can save and resume your report in any moments by pressing on the related blue button "Save and resume later"
If you do not see the questionnaire as in the screenshot above, please check that you are using a compatible browser
NB: you will only be able to edit your report for as long as the manuscript is in Independent Review stage (see the progression bar at the top of the review forum).