We should probably improve those e-mailed instructions.
Before GEDMatches, it was highly likely that a person's GEDCOM import included themselves, and therefore a duplicate profile of themselves was created which then needed to be merged.
After GEDMatches, it's likely that a person skipped themselves in the GEDCOM import to avoid creating the duplicate.
In your particular case, let's see ...
I found http://www.wikitree.com/wiki/Seymour-1128
Is that you or your father? If it's you, merge Seymour-1128 into Seymour-998.
If it's your father, add Seymour-1128 as the father on the edit page of Seymour-998.