This feature allows you to vote on behalf of your customer. It is helpful for you:
Start by selecting the post your customer requested to vote for. There you'll find the "vote on behalf" button.
Add the vote of your customer by entering their email or name. Their account will automatically show up.
Select the account and vote.
If the account is not showing up, the person has no account or is not invited yet. In that case, you will have to send an invite to this person.
The vote is completed and is added to your list of "voters & followers".