If a user already exists within the console but needs access to more accounts, you can grant that access from their profile without creating a new user.
Step 1: Find the user
In the left-hand navigation, go to the Administrator section and select Users. Locate the user you want to update - you can use the search field or filters at the top of the list to find them quickly.
Step 2: Open their profile
In the Actions column, click the ⋯ icon and select View Profile.
Step 3: Click Add Access
On the user's profile, click + Add Access. The Add Account Access dialog will open.
Step 4: Choose the accounts to add
Under Choose accounts to assign this user to, click Select accounts... and choose the accounts you want to grant access to. You can select as many as you need.
Step 5: Set permission levels
Each newly assigned account needs a permission level. You have two options:
Set permissions individually - assign a permission level to each account in the Assigned accounts list.
Quick-fill across all accounts - under Quick Fill All Accounts, choose a permission level from the dropdown and click Apply to all. This sets the same permission level across every account you've just added.
Step 6: Confirm the changes
Once you're happy with the selection, click Add Access. The new accounts will be added to the user's profile. The next time the user logs in, they'll see the additional accounts available to them.
Need to add a new user? Learn more here.