SharePoint provides you with four different permission presets but if you require something different please follow these steps.

 


 

1. Login to Sharepoint as a Full Access user.

2. Site Actions > Site Settings.

3. Click on Advance Permissions under Users and Permissions.

4. Click Settings Permission level.

5. Click on Add a Permission Level.

6. From here you can customize the new permission level.

 

After this is saved, you will now be able to grant a new permission level to new users or existing users.