How to predict future time series data using RNN?

I want to predict future values of the time series dataset using RNN. In fact, I tried the ntstool but it has the type of narx, nar, timedelay neural network; besides, I want to use RNN for the prediction. I found that that layrecnet is for RNN, but how can I do it with the NTStool?

Additionally, I want to know, what type of ANN, the ntstool based on?