Registering users with OJS 3.0

Dear @NateWr
We have a similar situation in test mode (localhost) as can be seen in the below screenshot.
image.
We use OJS 3.1.1.4, Manuscript Default Child theme. We also have two journals on the main site. All requirements for database and apache version in Xampp were passed.

Here is the detail issue:

After logging in using JM account, we set up journal and website setting. After logging out from the account, the page shows the login page. Even we chose the register button, the page still shows the login page. By the login page, when we used admin account (account for installation OJS) to log in, it shows Site Administration page. Here we clear data cache and expire user sessions then it logged out from all account. The page then shows the “main site” consisting of both journals and also there are log in and register menu at the page header. When we chose to register, the page shows “***This journal is currently not accepting user registrations” as @ania’s problem.

We followed recommendations to check session_cookie_name = OJSSID from Random (?) login problems and also to set *session_check_ip = Off from OJS 3 can't login, no errors - #2 by asmecher but the problem still unsolved.
How does user register to the journal from the situation like this? Please help us.
Thank you.