Within the "My Collections" tab of your profile, click on this button:
Now, give it a name! It can be anything that you feel best describes your Collection. (E.g. Favorite Games or Science Fair Ideas)
Add a description and you’re all set!
When you find a resource you like, click this button on the resource window.
Save it to a Collection.
Edit your Collections and resources any time on your profile page.
Click your name/avatar — or anyone else's — to browse Collections.
You can share whole Collections or find resources to add to yours.