I tried to link up logos to my kindle account. I followed the steps but when I enter "set kindle account to ***@kindle com" in the command box, there was no set up command. It only showed by search function. The set was failed. I doubt that it was because of the Chinese interface, so I tried to change the interface the language from Chinese to English. I followed the instructions advised in the community. First, I tried the Tools/Program Setting and change the language to English and restarted the program, but it didn't work. Second, I typed "unilang en" in the command box, but as I mentioned, the command function didn't work (in the Chinese interface?) so this approach also didn't work. I don't know whether I have only one problem (could not link to kindle) or two problems (could not change the interface language) or three problems (command function seems doesn't work, apart for Open and Search). Can anyone help me?