Open the Instagram app or website
Go to the profile you want
Tap or click the three dots if needed
Copy the profile link
The Instagram URL is the profile link
For your own profile, open your profile and copy the link
On desktop, the URL in the address bar is the Instagram URL
For a post, open the post and copy its link
For a story, use the share or link option if available
For a reel, open the reel and copy its link