Michael
I Love YTtalk
It's not that, i can't get to the alerts screen anymore, for some reason the button now leads to yttalk.com, and i can't view it anymore.
Other than that it's actually fine.
Press on your username at the top and then press on the flag icon, that will bring up your alerts if youre on a smaller device like a phone. If that doesnt work please let me know what browser you are using on your phone, I know IE has a couple of issues on Windows phones but Chrome latest version on Anroid is working well for me here