Test a Keras model using new data

Hello everyone. First of all sorry I am a beginner and I guess you are tired of beginners asking questions.
I have created a model using the tutorial for Linear regression with multiple inputs from TensorFlow for R - Basic Regression

For the creation of the model I have used a dataset in Excell.

After loading the model I don't know how I can apply it to a new dataset that has never been used for training etc. That new dataset is in Excell as well.
Is there a simple link?
Thank you very much. I am a bit desperate after reading a lot on the internet.