If you're using MMF 1.5 then you can use the string manipulator object to do the same thing.
Edit:
I should probably mention to do it youl would use the object and:
Replace [your character] with ""
I.e Replace "J" with "" would turn "Jack is John" to "ack is ohn".
Enjoy.
If you are always removing the same character in the string (like say, always the 3rd character from the left), you can always assign a new string the value you want by using the Left$ and Mid$ functions.
It works like this: Mid$("string",a,b)
Where "a" is how many places from the left your character is, and "b" is how many from the right to return the value from.
string = "AWESOME"
Mid$("string",3,2) would be "ES"
Mid$("string",5,1) would be "O", and so on.
It's a really useful feature.
So say you want to remove the 4th character, try something like this: