To share a resource with another user in an editable format you will need to share using the Collaborate option.

Note about sharing using Collaborate: anyone you share with has full editing access to the shared resource and can modify your version of the resource. If this is not desired, take a copy of the resource before sharing for collaboration to maintain your original copy.

To share a resource, go to your resource store page and find the resource in your list.
Click on the i button to the right of the of the resource title.
Next, click on the "I want to..." button and choose share from the list of options.
When the share menu opens, click on with people.
After clicking "With people" you will see the option to search for the person you would like to share with.
After searching, click on the name of the person you want to share with and scroll down to check the box beside collaborate. Include a message to the person you are sharing with and click Next.
This will bring you to the confirm share screen, click Confirm share.
Your resource has now been shared for collaboration.

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