Reply To: New Members Welcome Message
if in addition to this from time to time I could send messages to all members so they see in their profile message box.
This is already built in. For ex. you can:
User menu (below Howdy) > Messages > Compose and check This is a notice to all users.
If you want to show a welcome message/video, you can do this on the register page, but this would be seen before activation.
To show such a thing once a user logged in for the FIRST time, it is a bit more difficult, meaning you don’t know where a first timer access to your site.
Technically possible, but the scenario in this case is more complex and needs some reflexion to get it to work. And good knowledge of PHP. Do you have it ?
There was a plugin for that in the past, but i don’t know if it is already working. And it is no more maintained. Download from here if you want to test.