DNA confirmations are not done automatically on Wikitree. I presume that on some DNA site you are matching with your mother in a centimorgan amount that demonstrates you are parent and child -- if so, you can edit your own profile and click the radio button 'Confirmed with DNA' on the right hand side where it shows your relationship with your mother. BUT in order to do this, you need to add a DNA confirmation statement to your own profile (in a DNA confirmation, updates are always done to the child profile, not the parent) -- see the advice Kathie gives above on how to do this correctly.