You would need to edit the users table to include these new fields, then edit the registration page to add the form fields, go to insert -> Form and select the appropriate field type.
for the upload, you would need t add the Data Assist File Upload behavior (webassist -> File Manipulation -> File Upload)
then edit the insert record behavior to bind the new form elements to the new database columns.
for the image filed, bind the image column to the WA Uploaded Files -> Server File Name binding
Next, you would have to update the profile page. Edit the recoredset to include the new column in the select statement, and use the bindings panel to show the information on the page.