Exact solutions of a differential equation of the form dy / dx + xy = xy ^ 3

Hello I have this question to perform it on VBA the question is :
Develop a VBA programme that can derive the exact solutions of a differential equation of the form:
dy / dx + xy = xy ^ 3

The user should be able to input the values for y_boundary, x_boundary (initial condition) as well as an input value x in order for your programme to calculate y.

My code is below

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Screenshot (153).pngScreenshot (154).png

PLEASE I REALLY NEED HELP WITH THIS ASAP. TELL ME WHAT I AM DOING WRONG, I APPRECIATE ANY KIND OF HELP.
THANK YOU IN ADVANCE

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