Client wants a hyperlink??

This is not something that you can embed in the video in FCP; instead, you'd do it after you upload the video to youtube.

This video by Jenn Jager explains how: https://www.youtube.com/watch?v=8etyuk0-oAA

As Luis says, you can't add a link in the FCP editor because the video you export is just a collection of pixels.

You can add a link to your YouTube channel profile or in the video description.

You can also display a link card in the top right corner during playback, but this requires that you are a member of the YouTube Partner Program.

Another option is to create a QR code that links to the site your client wants a hyperlink for

Creating QR Codes On Your Mac

and then place the generated QR box on your video. Viewers can use their phones to get to the site.

MtD

Here is a different take on the "create QR code": you can easily create a Quick Action, and then all that is needed is to select the text, control-click and run it (or even use a keyboard shortcut - in this example, I used Command-Option-Control-0). I set this to place the QR code in the clipboard, so you can paste it, or make a new file for it using Preview (File->New from Clipboard), but you can change this to save the file somewhere.

place the generated QR box on your video.

Meg's suggestion is great. When I create a QR code following the steps in the linked video, I can't enter a URL. If I try to enter text while the Apple URL is still fixed, it beeps and refuses to accept it.

How do I solve this?

Enter the full URL, not just the domain

https://www.apple.com

MtD

Thanks Luis. I tried many times but I couldn't edit the text directly, but I was able to paste the URL by right clicking.

Thanks Meg, the shortened URL seems to work fine.