If you want more information about the document that you received, please contact the person who sent it.
When reviewing the document, go to the green button Review and sign -> I cannot sign, and either
a) choose I have questions or comments about the document. This will notify the sender of your questions and comments.
b) choose I don't want to sign the document. This will reject the case as well ass block other parties from signing the case as well. Only reject a document when you are certain that you do not want to sign it.
Please note: If the person sending has set a time limit to the case, you will not be able to sign after a certain amount of time. You'll then need to ask the person to send you the case again to be able to sign.