Important:

You must be a site owner or a site administrator to add or delete users.

Add user permissions in SharePoint site

1. Log in to SharePoint site. Click on Gear icon in top right corner and then click on 'site permissions'.

2. Which will open side pane. This Side pane may look little different depending on site type, 

VIEW 1 >

click on 'Add members' and select 'Add members to group'. 

OR some time it may look like this, VIEW 2 >

Click on 'Share Site'

3.  For next step depending on what your are viewing choose following actions,

VIEW 1 Continue >  

Should open new side pane, in which click on 'Add members' and in next window, enter user name or email id and select desired user from drop down list. 

OR VIEW 2 Continue >

Should open new side pane, in which type in user name you want to assign permission to and select desired user from drop down list 

4.  For next step depending on what your are viewing choose following actions,

VIEW 1 Continue > 

Make sure selected user is shown as 'member' and then click on Save. 

OR VIEW 2 Continue >

Choose permission level either Read or Write and then click on 'Add'

This should make user member of the site. And they will also receive mail like this.

Remove user permissions in SharePoint Site

1. Log in to SharePoint site. Click on Gear icon in top right corner and then click on 'site permissions'. 

2. In next Side Pane, expand 'site members - limited control' list by clicking on it. Next Click on icon of group name.

3. Previous step opens up new window with member group details. click on 'members' tab and then click on cross to remove desired members.