Million thanks @Simon_Cossar was assisted me to setting this , finally i can see [ Login with Discourse ] at my wordpress page. now i need clear my mind and figure it out the logic and login flow to more convenient my member go to wordpress make payment .
Now My Page Sign in flow like this
Login at wordpress > select login in with discourse > discourse login page > logged in > redirect back to wordpress website .
if i want those setting may i know how ?
im already done setting when member Login at wordpress using discourse login but redirect back to wordpress , but how about i want another setting when they Login at discourse using discourse login but redirect back to discourse but backend will automatic logged in at wordpress website too ?
Disable all my wordpress original login method only discourse login method.