Adding text to the end of existing string / text.

[DTK]

Realizing this is so frightfully simple, I cannot find an answer to it.
How does one go about creating a code to add text onto the existing text in a cell.

For example, a column already has city names in it and I want to add a state code in the same column. If I was doing it by hand, I would click F2 on each cell and just add it.

I tried recording a macro pressing F2, adding the desired text and looking at the code, but it replaces the entire cell with the new string. This is a problem when moving onto the next city (in my example) where it will overwrite the city in the process of adding the state.

Thank you kindly in advance.