Create modal sharing popup when user clicks an existing button

I'd like for users to see a popup that will let them copy the post address or share via Facebook or Twitter whenever they click a post 'support project' button. Modal popup should look like the attached image. The 'support' button exists and currently executes a command that updates a database, the modal popup would be in addition to this and needs to link to the post the user clicked the button in. This will be applied to all posts. Example of post with button: [login to view URL]