Hi Vivian Montalvo. If you are watching the videos from our website, there is an option under the right side of the video that allows you to click "I Did This". If you are watching the videos from our app, there is a red checkmark under the video (on the right side). Click on that. You are welcome to add any comments and/or photos and then click "Send" to save it.
If you have videos that you have already watched but didn't claim the "I Did This", you can still do this. Navigate to grokker.com. Your calendar will appear in the middle of the screen. Click on any days that watched a video. You will see "I Did This" next to all unclaimed "I Did This" videos. Simply click on that to claim the IDT.
I hope this helps. Let me know if you have any further questions.