How to add/remove users in MS-Access 2015.

There is no MS Access 2015. Earlier versions of Access using the MDB file format had a system of User Level Security (ULS) which was removed when they came out with Access 2007 (accdb file format). It isn't clear from your post if your database used ULS or some other solution for managing users.

Duane
Hook'D on Access
MS Access MVP

sorry, it is ms-access 2013
we were using ms-access 2003
how can we get around this removal of user level security so that we can add new users, please?

thanks.

You may be able to use the existing MDB files as long as you don't convert them. There are a number of good resources on the web such as this article. You may have lots of work ahead of you if you want to implement some form of security that isn't ULS.

Check out Garry's article.

Duane
Hook'D on Access
MS Access MVP