How can I transfer the ownership of my Organization?

You can transfer the ownership to an existing member. Here are the steps 

1. Click on your e-mail ID on top right corner

2. select "My Organizations"

3. Click on the ID (it's a number which uniquely identifies your Organization) on the left side 

4. Choose a member to transfer the ownership to and click "Transfer"

You should see the ownership change as soon as your refresh the page.