Thank you so much, TL MR3020 router I've run yesterday, then I have problems again .. I can not enter setup, because I have to change settings become wan lan, I have tried to install and unplug lan cable and power supply but still not managed to get openwrt. .
I have tried to ping the IP Address and successful but when I tried to get in openwrt, I could not connect, whether it is the effect of changes lan wan interface to that?
Can I restore into a lan wan interface?
I asked for help to change it, because I've tried all night to this day still does not successfully connect openwrt ..

I change the lan interface in this section

http://postimg.org/image/dz53zwnb9/full/

please