The system light is flashing or solid on. You can try to connect the router to different power outlet. And reset the router http://www.tp-link.com/en/article/?faqid=83 If still the same problem, the...

If the webpage can be opened properly on other computers, that means the webpage is working fine. Can the computer respond quickly when you try to open the websites and some file on the computer?...

where did you buy the product? you can contact tp-link to see if there is a English firmware for it or not. or contact the retailer to change to an English version.

What does it mean by nothing happen? after you saved it, all the settings were gone?

In your situation, you need to configure the external port and internal port. The router you have does not have the option, does it? perhaps，you can contact the tp-link to make sure if the router...

you can refer to the user guide or FAQs http://www.tp-link.com/en/support/faq/?pcid=204&problem=&m=&keywords=&faqid=