Of course! I try to make it in steps so it is easier to understand:

1. If not already done, set up your NXT Wallet by downloading the client from the official NXT website: https://nxt.org/
2. Buy NXT through any exchange (or directly through the NXT wallet) and put in in your wallet. Now wait till the ICO launches on August 5th, 2017
3. On the ICO date launch your NXT Wallet and log in.
4. Inside the Wallet click on "Monetary System -> Currencies" and search for the JLRDA currency.
5. Buy as much JLRDA tokens with your NXT as you want and hold them.
6. When ARDOR (and with it IGNIS) launches later this year, your JLRDA tokens will be swapped to IGNIS coins 1:1. You can access them on ARDOR with your NXT passphrase. You don't have to set up a new account.

Most important part is to always secure your NXT account and passphrase.

I hope this helped you :)