Actual Prediction

[europa502]

As far as I've understood from this program is that you are predicting the stock value on the input stock value. Thus here you arr inputting a stock value of a particular day and the model is throwing out the predicted stock value of the same day. How can I modify it to predict the value of the next day?
At first I thought maybe by putting x_train as the no. of days(from day 0 to day N) and y_train as the opening stock value, but then i get huge loss values (more than 200000).
A help would be appreciated.