First, you must know how to link your Gmail accounts.

Enter the second Gmail address you want to add as a linked account and selectNext.

Enter the password of the second account.

Gmail with the Add another account button highlighted

Repeat this process to add additional Gmail accounts.

Select your profile picture or name.

In the list of linked accounts, choose the email address for your other Gmail account.

The Google sign-in screen with the Next button highlighted

The other account opens in a new online window tab.

Gmail with a second account highlighted

Gmail browser tabs with a different Google account in each