How to add extra Terms in Existing Physics Equation or Edit the equation

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Hello I am trying to build a 2d model from level set equation .My equation is a modified level set equation with an extra term(highlighted the term). I have attached the image of the equation(equation 5). I want to add that term in the existing level set equation of comsol (attached the image of comsol interface). I cannot find the way to add new term to it. Please help me with that. Thank you



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