You can save any study/trial to a convenient "favorites" list. When looking at the details for an individual study/trial, tap the star near the top right. The star will change color, and a message will confirm that you have saved the trial.
To view previously saved studies/trials, tap "Saved Trials" from the app home screen. You can un-save a study/trial by tapping the star again. A message will confirm your action.
App only FAQ:
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