Bulk update users to Enable Membership

If you use the Import and export users and customers plugin to import users, there is a code snippet you can use to import memberships: Import user memberships

Instructions are in the code snippet’s comments, but basically, you don’t have to change anything. The only think you really need to make sure of is that you have the column heading correct in your CSV file. It will be the slug of the membership with the prefix _wpmem_products_. So if the slug of the membership is my-membership, then the CSV heading line would be _wpmem_products_my-membership