customized user profile page

1. Is there a way so that user profile page not only consist of detail information of user but other things? For example, user can upload pdf file from their user profile page, not from registration page

Yes, one of the form field types is “file” which allows you to include a file upload field. Custom fields are created in the plugin’s Fields tab by selecting “Add New”.

3. How to make custom file field able to accept pdf file?

You can set the accepted file types when creating the custom field.

2. When I chose moderated registration, how do I made soon-to-be member to upload proof that they already pay the fee? usually they sent image or pdf file as proof of payment. because this website not going to use online payment

I would assume you would make the field required for registration.

1. Is there a way so that user profile page not only consist of detail information of user but other things? For example, user can upload pdf file from their user profile page, not from registration page

Yes, one of the form field types is “file” which allows you to include a file upload field. Custom fields are created in the plugin’s Fields tab by selecting “Add New”.

How to make certain field only appear in user profile page but not appear in registration page?
For example, I want to create field Upload Abstract. But that field can only being showed when member go to their User Profile Page, not on Registration Page