Help with Flow Designer

[ItayB]

Hello everyone,

This is my full mission:

Disable OOTB self registration. Self-registration will only be allowed through an invitation email sent by the Forum Admin.
1. Add new mandatory field to forum form called "Forum ID" of type string.
2. Add to the communities self registration form a new mandatory field called "Forum ID" of type string.
3. Add to the communities log in form a new mandatory field called "Forum ID" of type string.
4. Once the user click "submit", an approval request will be sent to the forums admin for approval (according to Forum ID)
5. If approval request was approved, a new community account will be created (sn_customer_communities_user_list) -> This table not exists.

1, 2 and 3 -> Done.

Now i need to do 4 and 5, I think to do it with Flow Designer but i dont know how. 
Can someone please help me with build the Flow? 
In addition i need to know when a community user is created which table get a new record of it ? because i dont know this. 

Need your help !! 
thank you.

[Shruti]

Hi,

For 4th,5th there is a OOTB approval workflow.

Go to the forum and Enable membership for the forum and select Forum Membership Approval workflow. It 

     * Fetches the approvers list for a given Forum which can be requested for membership

     * The approval list includes the Forum Admins, if No forum Admins are present it includes Community Admins.

     * If there are no Community admins it includes the System administrators

To check community profiles, navigate to sn_communities_profile.LIST

[ItayB]

In which table i need to do this?