Polls you can use a combination of various extensions to:
- Show text with agreement that the user is +18
- Do something based on their input, like adding them to a +18 group
- Modify tag permissions to allow only +18 groups to post
I have never set up a similar system, so it’s better to ask at https://discuss.flarum.org for the specific workflow and combination of extensions to use. However, from the extensions that are available at FreeFlarum, it seems that a simple solution might be to use the “Group Invitation” extension to create an invite link to the +18 group. Then, set the tag permission to only allow users in the +18 group to post. Lastly, using “FoF Pages”, create a page that shows some information (like an agreement, or something) and a button with the link to join the group – or just share the “join group” link directly with users, so they can add themselves to the +18 group.
NB: please, remember to also check FreeFlarum’s Terms and make sure your forum content complies with that
