Agentless SidHistory Migration

On the QMM user guide under the section "Adding SID History" This is stated for configurating the environnement for agentless adding:

Grant Migrate SID history permission to Target DSA Account on the target domain object.
NOTE: This permission must be applied to This object only.

I've read this statement a few times and I am still unable to understand what to do here. What are the specific steps that I need to do here. Anyone knows ?

If my DSA account is in the domain adminstrators group. Do I still need to do this ?