Applying Probabilities
Potentially, you can apply the same predicted probability to three groups:
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All Adults. If you see a way for your selected values to apply to all 260m adults, you can regard those values as targets to hit to increase (or decrease) the 17% (.17) and 45m numbers. To ensure they apply, hold constant every socio-demographic variable.
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The Target.
If you select values that can't apply to all adults (e.g., everyone can't be 18-34), no worries. The target group is limited to those with your socio-demographic selections. So if you choose Age ("18-34"), Urbanicity ("Suburban"), and Education ("BA/BS+"), the result will apply to 7m adults.
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Specific Individuals. If the values you choose are your own, or those of someone you had in mind, the resulting estimate will be your, or their, predicted probability.