Membership Packs allow you to setup subscription-based pricing packages. This enables your customers to post unlimited ads for a set period of time or until the membership becomes inactive.
There are a few options available in terms of how you would like the membership system to work.Not Required - a membership is not required in order to list an ad.
Required for All - a user can only list an ad if they have an active membership.
Required by Category - limits users with memberships to list ads in certain categories.
You can find further information on how these are set up for a better idea of how it works
here. Thanks.