Hi,
Please follow the instructions.
1. Open template language file from the below url
language/en-GB/en-GB.tpl_shaper_shopin.ini
2. Find out the code
;Login Page;
SHOPIN_ACCOUNT="Account"
COM_USERS_LOGIN_TITLE="Log In"
COM_USERS_LOGIN_USERNAME="Username"
COM_USERS_FORGOT_PASSWORD="Forgot your password?"
COM_USERS_LOGIN_DONT_HAVE_AN_ACCOUNT="Don’t have an account?"
COM_USERS_NEW_ACCOUNT="Create a new account"
HELIX_LOGIN = "Login Here"
HELIX_ALREADY_ACCOUNT = "Already have an account?"
HELIX_LOGIN_LOGO="Login Page Logo"
HELIX_LOGIN_LOGO_DESC=""
MY_ACCOUNT="My Account"
-Thanks