I have had time to investigation then found solution.
This exactly work for me. Please refer to below.
1. Find container id of postgres
>sudo docker ps | grep postgres
2. Enter into postgre server container
> sudo docker exec -it <container id> /bin/sh
3. Connect postgre SQL server
> psql --username=postgres
4. Connect Portal Database
> \connect portal
5. List tokens that is waiting activation.
(** Note: only upper case characters are accepted in query statement, and semi colon is required at the end of query statement)
> SELECT * FROM portal_token;
6. Find right “token” column through looking at “create_ts” and other columns
7. Access below URL in browser
> https://<tenant FQDN>/admin/app/account-setup#token/<token value>