Johann Mushard - I'm new, how do I merge this person?

This person (Johann Mushard) Johann Mushard, Lutheran minister of Loxstedt and father of a Luneberg Mushard who married in 1736, is I believe the same as this person (Johann Mushard) Johann Mushard, minister of Loxstedt and brother of a notable Luneberg Mushard who died in 1708 and who, according to this biographical notice (https://de.wikisource.org/wiki/ADB:Mushard,_Luneberg) had a nephew also named Luneberg.

How do I merge these two persons? Please forgive me if this is a stupid question, but the "drop-and-drag" method from the FAQ is not working for me.

Thanks!

Johann Mushard
Johann Mushard