The screws are most likely black & up under the valance VERY hard to locate. One of mine had small screws into the bunched up fabric on both lower corners. So it's kind of a hide & seek game with the screws.
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Danny & Linda
Full-timed 10+ years
Former '13 FB owner
Traded '13 GMC Denali DRW D/A
Currently rv & truckless
Replacement undetermined
Look up under the roller and you will need a Phillips Screwdriver that holds the Valance to the Shade brackets. It's helpful if you have someone hold the Valance while you unscrew the screws.