Stuff(s1, n1, n2 [, s2 ])
The position in s1 to insert the new string s2.
If n1 is less than one, the function assumes the first character position. If n1 is greater than length of s1, the function assumes the last character position.
The number of characters to delete from string s1, starting at character position n1.
If n2 is less than or equal to 0, the function assumes 0 characters.
s2 (Optional)
If you do not include a value for s2, the function uses the empty string.
This adds the word Street onto the end of the first occurrence of Address.

Stuff