Even if I know very well where to get keys (hex and or decimal) and know how to edit keys, this may be true only with my receivers, and in answering your question in such a way that will suffice you I may have shortcomings. But anyhow, I hope that you asked "how to do it via remote" simply because you can see (in your menu) that there is a chance for that, is this right?
Visit this site: http://paytv.ws. Here you can find softcamkeys and or MrKeys or combination of both.
Receivers with keyeditor accepts either hex or decimal format. In your receiver's menu find anyone of these (if its available): code edit or key edit. You can then play with your keys! Enjoy!