"I tried to soften the butter I am using to bake with, and it melted. What should I do?"
That butter is best set aside for other uses, like smearing on toast or melting over vegetables or adding to sauce. But it is no longer well-suited for baking. Even if re-solidified, it will not interact with flour in quite the same way, and that will affect your final result.
For some tips on softening butter, see our video: How to Soften Butter.