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After opening the review, you will be shown the areas that have been made available to you in Review Configuration. You will be able to edit any Notes and User Defined Form fields that have been set up for you to fill.
Setting up notes for remote filling is explained in Review Notes in Configuration.
Setting up UDF fields for learners and contacts is explained in User Defined Forms for Review Signing.
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At the bottom of the page, a box is available for you to draw in your signature. You can also select Use Keyboard and type your signature in if you would prefer.
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