Please use code tags around more than a few lines of code. It is easier to read then.
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If FirstName is not Null, then open the [Actor Search] form according to what's in FirstName control. Now process the next line, which is to end the IF.
Now move on to the next line.
If LastName is not Null, open the [Actor Search] form (but it's already open, so let's reopen it).
Set the LastName control to be what's in the LastName control on the first form. This clears what's in the FirstName control of the opened form.
Rinse and repeat as we go, until finally, the Union data is the only thing showing in the form while we watch the screen flicker each time it closes/opens.
At least that's what I think will happen.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.