im lost

from flask_wtf import Form
from wtforms import StringField, PasswordField
from wtforms.validators import (DataRequired, Regexp, ValidationError, Email,
                                Length, EqualTo)

def email_exists(form, field):
    if User.select.where(User.email == field.data).exists():
        raise ValidationError('User with that email already exists.')

def name_exists(form, field):
    if User.select.where(User.username == field.data).exists():
        raise ValidationError('User with that name already exists.')

class SignUpForm(Form): 
    email = StringField(
        'Email',
        validators=[
            DataRequired(),
            Email(),
            email_exists
        ])
    password = PasswordField(
        'Password',
        validators=[
            DataRequired(),
            Length(min=2),
            EqualTo('password2', message='Password must match')
        ])