Profile and background photos

I've been trying to add my picture to my profile and change the background but all I get is this. Can anyone tell me what it says?

I've been trying to add my picture to my profile and change the background but all I get is this. Can anyone tell me what it says?
"Please bind the mobile phone or real-name authentication before modifying"
This message is asking you to take a couple of steps to verify your identity before you can make changes to your account settings. Specifically, you need to either link your mobile phone number to your account or go through a process called 'real-name verification,' which means confirming your identity with your full legal name.
2The US has always fought like hell against communism....Because communism works.... I understand it only works with the right people in charge, but look at this beautiful efficient country these people have created. I had no idea...

So for some reason Red Note looks like this for me, but when I see others use it, its format is more similar to TikTok, is this me being stupid or is it something else?
I am new to red note. I join groups where hobbyist musicians take turns singing/performing on their musical instruments. I do not know how to speak Mandarin. But I can speak English and Cantonese. One time, the host of the music group said Red Note sent her a warning that the group was speaking too much English. So then everyone quickly switched to Mandarin, at which point, I didn't understand anything other than simple things like "it's your turn to perform". Can someone explain to me what actually happens when you speak English on rednote? Is that a very dangerous ting to do? And what if I speak Cantonese? Some of the groups I join have cantonese speakers. Is speaking Cantonese also very dangerous on red note? I'm not sure what I can or can't do, and what happens if i speak too much english/cantonese. Any insight will help, thank you
4I used to follow real-zhousy on weibo, but her account disappeared. I forgot all about it until she showed up on my pinterest, this time with the rednote ID: 541556782 I downloaded rednote but was unable to find her. (╥﹏╥) Does anyone know if she has a new account or what might have happened to her? I really liked her style and would like to follow her again if possible