[Django]-Django: How to change default SignUp fields

Okay, I figured it out. Listing all properties of a form by:

form = SignUpForm()
for d in dir(form):
    print(d)

I found, by trials and errors, that you can list fields of the form:

form = SignUpForm()
for d in form.fields:
    print('field name:', d)
    print('field label:', form.fields[d].label)
    print('field text:', form.fields[d].help_text)
    print("")

returns:

field name: username
field label: Username
field text: Required. 150 characters or fewer. Letters, digits and @/./+/-/_ only.

field name: display_name
field label: None
field text: Your display name

field name: password1
field label: Password
field text: <ul><li>Your password can&#39;t be too similar to your other personal information.</li><li>Your password mus
t contain at least 8 characters.</li><li>Your password can&#39;t be a commonly used password.</li><li>Your password can&
#39;t be entirely numeric.</li></ul>

field name: password2
field label: Password confirmation
field text: Enter the same password as before, for verification.

I can easily alter those fields by writting:

x = form.fields['username']
x.label = "foo"
x.help_text = "bar"

and I got: