English plural words ending with S - how to make possessive nouns ?

How should I make plural words ending with "s" possessive ? In case of singular words there is usually added apostrophe and "s" at the end.

But for example how can I make possessive the noun "users" ?

You can make a plural noun possessive by adding only an apostrophe at the end, when the noun ends in s. For example, when you would like to say, that something belongs to somebody, like account of user:

Singular possessive noun will be: user's account

Plural possessive noun will be: users' accounts