Can I add more fields to an end-user profile?

Can I add more fields to an end-user profile?

Hello

We're currently only using Zoho Desk for ticket-management and Knowledgebase. We currently don't have any login requirement for our Knowledgebase at all.

I'm now experimenting with perhaps using the forum or login capabilities of Zoho Desk, but we need a few more custom fields attached to the end-user profile. I have been trying to add more fields, but havent been succesful.

Is it at all possible to add more (custom) fields to the profile details? We would need these to be editable by the end-user: