you need to change only 4 things highlighted in Red
' ------------------------------------------ Start Script ----------------------------------------
VERSION BUILD=7401110 RECORDER=FX
TAB T=1
URL GOTO=https://twitter.com/signup
TAG POS=1 TYPE=INPUT:TEXT FORM=ACTION:/account/create ATTR=ID:user_name CONTENT=firstname<sp>lastname
'only letters, numbers, and underscore for screen name, 15 chars max
TAG POS=1 TYPE=INPUT:TEXT FORM=ACTION:/account/create ATTR=ID:user_screen_name CONTENT=screen_name
SET !ENCRYPTION NO
TAG POS=1 TYPE=INPUT:PASSWORD FORM=ACTION:/account/create ATTR=ID:user_user_password CONTENT=password
TAG POS=1 TYPE=INPUT:TEXT FORM=ACTION:/account/create ATTR=ID:user_email CONTENT=email@email.com
TAG POS=1 TYPE=INPUT:CHECKBOX FORM=ACTION:/account/create ATTR=ID:user_discoverable_by_email CONTENT=NO
TAG POS=1 TYPE=INPUT:CHECKBOX FORM=ACTION:/account/create ATTR=ID:user_send_email_newsletter CONTENT=NO
TAG POS=1 TYPE=BUTTON ATTR=ID:user_create_submit
PROMPT Enter<SP>Captcha: !VAR1
TAG POS=1 TYPE=INPUT:TEXT FORM=ACTION:/account/create ATTR=ID:recaptcha_response_field CONTENT={{!VAR1}}
TAG POS=1 TYPE=INPUT:SUBMIT FORM=ACTION:https://twitter.com/account/create ATTR=ID:captcha_submit
'skip the finding friends, etc
TAG POS=1 TYPE=BUTTON ATTR=TXT:Next<SP>step:<SP>friends<SP>»
TAG POS=1 TYPE=BUTTON ATTR=TXT:Next<SP>step:<SP>others<SP>»
TAG POS=1 TYPE=BUTTON ATTR=TXT:Next<SP>step:<SP>You're<SP>done!<SP>»
'sign out
TAG POS=1 TYPE=A ATTR=ID:sign_out_link
' ------------------------------------------- End Script ----------------------------------------