why i can't reply other people's discussion?

Hi Ziqiwang, Welcome to Mylot. I was having the same problem earlier. It seems to be fixed now so you should just try again. Have a nice day!

You can log out this page and again log-in. Welcome to myLot. Happy Mylotting

i had problem like you.sometimes i can not to post or response to any discussion. usually i log out then i login again.

I'm having such problem sometimes, actually i encountered it again earliers. I think something is wrong with mylot or my connection. . .Just a suggestion, try to restart your browser after 10 minutes then try again. Actually not only on commenting others but also posting my own discussions is sometimes not able to be posted.