Speed Dial question

Hope this is an electronics question. Posted this a few months ago without getting a reply. I'm trying again because I still can't find the answer. I thought this would be easy but could not find an answer using search on in the manual. 2008 Prius I have placed a few numbers in Speed Dial and it works well. My only problem is one entry. It appears twice in the 1st Speed Dial page - once the icon looks like a house and once it looks like 2 index cards. I want to remove/replace the entry that has the index cards icon but it appears eternal - I can't seem to remove/replace it. What do the index cards represent? How do I get rid of the entry?

 

I suppose I already know the next answer but, just in case, any way to eliminate the 'most recent' and just assign a number to that slot?