MsgBox understand value in ComboBox

I have 4 UserForms.
First When I click on Day in UserForm1, UserfForm2 pups up, then choose product and fill other comboBoxes. When all of the ComboBoxes fills out, then I press Pro and userform3 pops up and fill out other data. Information in userform3 and userform4 is based on Credit comboBox on userform2. sample.xlsmIt means one of them is about "credit" and other is about "Name"
So my question is: I want to create a message box that when I fill out userform3 notice that the user should fill out userform4, if it is possible.
For example, If I chose "CoCO" in userform1 then in type ComboBox there are two options. When I click on next and fill out userform3, after clicking on save, the message box pops up and notice to fill out "Name" userform(or userform4)

I hope the scenario is clear!

Thanks for your help

http://www.ozgrid.com/forum/showthread.php?t=196260

sample.xlsm

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http://www.ozgrid.com/forum/showthread.php?t=196260