Backtest with Ninja Trader

I wrote at the support team but I didn't receive any reply so I have to ask here
I'd like to backtest, and I have to find some source of data. Where I can find it (compatible with ninja trader)?

Connect to Gain demo (for fx cash data), but do not open a demo account so leave name and password null, and put Demo in the Mode, and use ninja trader servers as the backfill. Open a chart of you desired symbol and backfill it to get the amount of data that you want. I only have the free version so I don't know if I can do backtests or not (I think not), but this will get data into your database.

Ty,
Right now I can't fill the daily chart I don't knwo why, but thanks for the advice

Try using a 1440 minute chart.

Same result... nothing diplayed
I will email the support... ty mate