Sorry Peter but it looks like only you can do this merge:
We're sorry. One of these profiles is not Open and you are not on either profile's Trusted List. Although permission for the merge has been recorded, it would violate our privacy controls to enable you to complete the merge. Please post in G2G if you would like to discuss this. Thank you for understanding.
Let's try and walk you through it - its a good skill to have, knowing how to merge.
First things first, what error are you receiving when you're trying to merge? Is it that someone else is the profile manager of the other profile? If so, have yourself added to the other profile's trusted list and then you can do the merge. Have the profile manager go to the privacy tab and enter your email to add you to the trusted list then try the merge again.
If it is something else, post the error you're receiving.