Hello,
I did a mistake entering a new word (班吗),
Now I don’t find a way to submit the correction of the pinyin,
Can you help me?
Thanks
You can submit corrections in the mobile apps from the Info screen (scroll to the bottom). However, is the word you’re looking for, by chance, 斑马/斑馬 
?
We have that one in our system already. You can copy/paste from below and i’ll be added to your study deck.
斑马
Happy studies!