When user filled first tab or second tab and click submit. It has error, they do not know how to do it ?

This is not possible, when user miss to fill some informations and try to submit the system do:
- Show first tab where miss required field
- Show alert message
- Highlights all tabs where values missing
- Highlights fields to fill
see screenshot

I want edit profile page has button next in tabs and submit button in last tab like register profile page.

Sorry this is not possible with a simple way.

From your image seems that in your template missing some core classes to show message correctly. Can you please post me your site link to check this?

If edit profile page has next button and tep by tep page in edit profile page

As I said this is not possible with a simple way, Step by Step does not make a sense for Edit Profile page: for example If a user need to change one value in first tab and you have 10 tab then the user need to press 10 times "Next" button before save changes?!

They don't know many about technical

Highlights And Alert messages are not technical things.

Hi,
sorry this is not so simple, because buttons are not in the tabs, submit button is included into the form. Also to make something like this you need to change the code of a Easy Profile Javascript core file; this cause one important thing, when you upgrade Easy Profile you will lose modifications and maybe modification are not compatible with new versions.

Can you help me develop a this part ?

Sorry but develop this require many time.

Can you guide me custom error for this error because when a user not fill the fields require, error will very long. I want show only one error sample :" your fields require not yet filled. Please fill in full. Thanks guy "

Yes and not, we can help you to style error message (also to cut a part) via CSS***, but we can't change the behavior, because error message not come from Easy Profile, it come from Joomla. Easy Profile extends Joomla user management (not replace), so edit profile page is the same of Joomla with many improvements but error alerts are managed by Joomla.

*** as I said in my previos reply I need your details to help you to make this. you can use the form below the reply in "Site Details" tab.