When i try to connect a device to my router it asks for password. When i put it in it doesn't work. So i have been going to my router web page and adding the mac address to get it to work. Why doesn't

My wifi router will not identify the T3U. The manager says it's there & working. The computer wifi works fine then i disable that & turn on the T3U. When I try to connect to router it tries to identif

I can't get my T3U wifi adapter to be identified when i try to connect to my wifi. When I use computers wifi it works. Computer says the t3u is there & working properly. I turn off computer wifi then