Guide

1. Inside your SharePoint site, head over to the top-right corner and click the 'Settings' icon.

2. Select 'Site Permissions' from the list of options.

3. Tap 'Add Members' to proceed.

4. Tap 'Add Members' and then choose 'Add Members to Group'.

5. Click 'Add Members' one more time to proceed.

6. Click the 'Add Members' input field and type the name of the user to whom you wish to give access.

7. Finally, click 'Save' to apply the changes and give access to the newly added members.