Norm Radder

A problem might be with what the calling code does with the returned value.
In the first code, the value in head will be what was passed. Except for  a null value.
In the second code, head will point to the added node.

static SinglyLinkedListNode insertNodeAtTail(SinglyLinkedListNode head, int data) {
In this method, head is a local variable.  Changing its value won't change the variable/value that was passed to the method.

What do you mean?

Nothing.  That post should be ignored.

why cant i just use head to find tail of link list here

It is a local variable so your idea should work.
Did you try it?  What happened?

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Ignore this

  how to set all the values of setter

Create an instance of the class, Generate a random value for each setter method and call the method with the value.

I don't know any of the classes you are using.
How are you trying to debug the code?  Add some print statements that print the values of variables as the code is executed so you can see the execution flow and some reasons why it is executing the way it is.

Another thing: Don't ignore exceptions - Always call the printStackTrace method inside of a catch block

There are two methods: indexOf finds the location of a substring in another String.
The substring  method extracts a String from another String.
So if you know the locations of the delimiting Strings "*-*" you can use those locations to get the substrings of what is before the first delimiter and what is after the second delimiter. Concatenating those two Strings will get a new String that does not contain the delimiters and what was between them.

have a customer delimiter of *-* between strings that i want to remove, for example: *-*RedorDead :*-*

Ok, "*-*" delimits the Strings to be removed.  The String class's indexOf and substring methods could do that.

When designing a class, you need to have a reason for the class to exist and an idea of what data and methods the class needs to have.
What is the purpose of the ContactInformation class?  What data does it need to hold? 
It is up to the class's designer to answer those questions so the class can be designed and written.

It seems you are trying to write the code for a class without having any design for the class.

If I were designing that class, I'd have it hold the first and last name and other info like: email, phone, geolocation, mailing address, etc

What data is the ContactInformation supposed to contain?  How is that data copied into an instance of the class?

i have defined a datatype of firstname as ContactInformation

Why?
"Cerosh" as a String  could be a person's first name, not a reference to an instance of a class.

Is the ContactInformation class supposed to contain a person's first and last names as Strings?

Can you show a sample input with the desired output so we  understand what you are trying to do?

What line in the source code is that error on?

Should that value be passed to the constructor as a String: "Cerosh"?  Not as a reference to a ContactInformation object?
The constructor would have to be changed to take String as its arguments.