Hi @eddie_nunezt. To share a schema, you need to use the Share link which is below the download and preview buttons. Schemas under your own login look like this: https://www.mockaroo.com/schemas/108856
and can't be accessed by others unless you share the project with them. Share links look like: https://www.mockaroo.com/f0f93f40
However, I have modified my example to use a hidden row number field. Simply use 2 x underscore (_) in front of a field name and that field is hidden from view in the mock data, though you can use it in formulae.
So the row number field becomes:__id
Note, you could call this __row_number for clarity in your own project
and the formula becomes:now().utc-minutes((100-__id)*3)
(replacing __id with __row_number if you change the name)
Here is an example that may work for you: https://www.mockaroo.com/492c9f30