The instructions from YouTube can be found HERE: 

Follow these steps to grant access to your YouTube channel easily:``

Step 1: Sign in to YouTube Studio

• Open your web browser and go to YouTube Studio.
• Sign in with the Google account linked to your YouTube channel.
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Step 2: Access Channel Permissions

• In YouTube Studio, find the menu on the left side of the screen.

• Click on Settings at the bottom of the menu.
  
• In the settings window, select Permissions from the list.
  

Step 3: Invite New Users

• Click on the Invite button on the Permissions page.
• Enter the email address of the person you want to grant access to, [email protected]

• Choose the role you want to assign:
  • Manager: Can manage all aspects of the channel, including adding or removing videos.

Step 4: Send the Invitation

1. After selecting the role, click Done.
2. Review the invitation details and click Save.
3. The invited person will receive an email with instructions to accept the invitation.
   
   

Step 5: Confirm Access

1. The invited person needs to accept the invitation from their email.
2. Once accepted, they will have access to your YouTube channel based on the role you assigned.

Additional Tips

• Ensure the invited person's email is correct to avoid issues.
• You can manage or remove access at any time from the Permissions page in YouTube Studio.

Once the user accepts the invitation from the email they receive, they will have the specified level of access to your YouTube channel.