Hi,
You want to create CRM users from this form??
If yes then you have to create your own entrypoint to pass data to and then you can create a User by Custom Code.
And if you are talking about adding Lead entries into CRM from this form, then you can use Web to Lead form feature of SuiteCRM.
https://community.suitecrm.com/t/how-to-create-a-web-to-lead-form-in-suitecrm/84643