Open the Instagram app
Go to the post you want to share
Tap the paper airplane icon below the post
Choose who you want to send it to
Tap Send
To share to your story, tap the paper airplane icon
Select Add post to your story
Edit the story if needed
Tap Your Story to post it
To copy the post link, tap the three dots on the post
Tap Link or Copy Link
Paste the link where you want to share it