WCMp shipping class

Hi I have some issues in my WCMp wordpress. I have two sites, https://www.artcraft.club and https://www.dresscustomstudio.com

Q.1 my account page, during member registration there is no message showing registration successful or done, no instruction to inform member to check their email. what is the solution?

Q.2 member is unble to log in through this page https://www.artcraft.club/my-account but no problem through https://www.artcraft.club/wp-admin, what is the solution?

Q.3 in Vendor dashboard, there is shipping option for vendor to fill out but it doesn’t work. I have to create shipping class by countries for example Sell to all countries from UK, Sell to all countries from Canada and so on, and I have to add the flat rate value in each shipping class on my merchant account. what about the issue if each vendor has different shipping rate according to their different range of products, I believe each product may have different shipping rate

thank you