MyBB Community Forums

From: www.myforum.com/member.php?action=register

to a custom URL

Even something like

www.myforum.com/member.php?action=r3g!ster2019

Open ./member.php and find;

if($mybb->input['action'] == "register")

and Change it to;

if($mybb->input['action'] == "r3g!ster2019")

Now you've to Change Register link from header_welcomeblock_guest template as well.

Thanks, I'll Try

Sure.

I changed the registration url in member.php and header_welcomeblock_guest theme
but when I click on "I agree" button in registration agreement page, I get a blank page

Another solution is to use .htaccess redirect.
I use a plugin for wordpress that does this (Better WP Security)
and it does this (changing all the slugs) via .htaccess.
So it's possible to apply this to MyBB but I am not an Apache expert to help you write the code.
Showing sharing a door to a path you could explore.

Thanks very much for your help, But I'm not an Apache expert neither ...
I think .htaccess redirect is great but it won't change the main url and spammers can easily find it by adding "member.php?action=register" at end of site url (or replace it with "index.php" and site url)