Click on the pictures to see the large version.
1.) Open your Sharepoint site.
2.) Select "People and Groups" in the menu on the left.
3) Click "New" above the user list and then "Add Users".
4.) Enter the user names of the all new users in the box "Users/Groups". Separate the user names by ";" (semicolon).
5.) Click the button "Check Names" to ensure the entered names are correct.
6.) Select the necessary permissions and confirm the changes by pressing "OK".