How do I modify a user-defined function in SQL Plus

I have created some functions in my database. Can anybody tell me how to modify/edit those functions?

PS C:\> $Class2 = New-Object MyTest.Class1
PS C:\> $Class2
MyString Struct1Property Struct2Property
MyTest.Struct1 MyTest.Class1+Struct2
PS C:\> $Struct2 = New-Object MyTest.Class1+Struct2
PS C:\> $Struct2.Property = "X"
PS C:\> $Struct2
Property
X
PS C:\> $Class2.Struct2Property = $Struct2
PS C:\> $Class2.Struct2Property.Property
XPS C:\> $Struct2.GetType()
IsPublic IsSerial Name                                     BaseType                                                                    
False    False    Struct2                                  System.ValueType                                                            
Struct2 is a valuetype, (by value)
The classes are by reference
PS C:\> $Struct3 = $Class2.Struct2Property
PS C:\> $Struct3
Property
X
PS C:\> $Struct3.Property = "Y"
PS C:\> $Class2.Struct2Property.Property
X
PS C:\> $Class2.MyString = "A"
PS C:\> $Class3 = $Class2
PS C:\> $Class3.MyString = "B"
PS C:\> $Class2.MyString
B

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