where and how do I add aka to detail information?

AndersonSharon

Where and how do I add aka to detail information?

Dennis J Yancey

by aka

I assume you mean alternate names a person was known as.

(such as nicknames)

they are usually added as "Alternate Names"

see: https://www.familysearch.org/en/help/helpcenter/article/how-do-i-add-nicknames-to-family-tree