You can also sign a study, thereby signing all experiments in the study at once. Go to the Study Administration and click on view study to open the study information sheet.

Click the Sign button. 

In the appeared pop-up window, a list of all experiments within the study is shown that can be checked for signing. Enter your credentials and click on Sign Experiments to sign and lock all selected experiments in the study. Experiments that are already signed are disabled for signing.

Note that studies can currently only be signed when a single signature is required to sign and lock an experiment. When the witness signature option is active, the witness signature has to be made one by one for each experiment in the study.