You can join two Strings together using the "+" operator.
Dim gogo As String
Dim popo As String
gogo = "Hello"
popo = "world"
gogo = gogo + " !!! " + popo
The code below will print Hello !!! world on the form.
The expression gogo + " !!! " + popo is equal to
Hello + " !!! " + world and that's equal to "Hello !!! world"
So eventually, the command that will be executed is gogo = "Hello !!! world"