because you have a combined network you'll need to do option 2 ww mentioned. in a combined network there are hidden node group names appended to the networks: - appliance, -switch, -wireless, and so on.
so, make a copy of your splash page then edit the continue.html file in there. should be a super quick fix.
first create a new splash page and you can choose copy from your current "modern" page.
Next, click the continue.html file and then the edit tab. Find the line with WELCOME and type whatever you want between the <h1></h1> tags.
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