How do I replace the games that are not working and the game I deleted?

I got a r4 nds box last year and I accidentally deleted a game and three games are not working, I really want to delete the games that are not working for new ones but I dont know how. Could someone please help me ?How do I replace the games that are not working and the game I deleted?You could go into ....um. you could go into http://www.game1010.com/video/video/_Pnz鈥?/a>

this tells us how to do things like deleting and putting on the r4.....50/50