A quick selfie will do the trick, or a picture of your pet, or just any photo. You just need to upload a photo of some kind. If you are not willing to add a photo of some kind, we regret to inform you that you won’t be able to open a XAPiT account.
Here are the full instructions on how to set up a XAPiT account, including how to add a photo: https://xapit.com/faq/view/10/1/3/0/how-to-sign-up-for-a-xapi-t-account-in-a-web-browser. We hope to see you on XAPiT soon!