I'm unclear where you're redirecting from. If you're looking to redirect from Instagram profile pages to Piokok profile pages, then you'd want something like:

• Example URL: https://www.instagram.com/linustorvalds
• Include Pattern: https://www.instagram.com/*
• Redirect to: https://www.piokok.com/profile$1
• Choose Wildcard
• Description: Redirect instagram profiles to Piokok profiles

Edit: for some reason I can't seem to remove the trailing / from www.instagram.com* You don't want the last backslash in that line. Nothing inbetween com*.