Zenkit

You can change whether new tasks get added to the top or bottom of lists from the "General" section of your Zenkit To Do app settings. To find these in the mobile app, tap on your name at the top of the home menu, then on "Settings" > "General". In the web or desktop app, click on your profile icon in the top right hand corner, then on "Settings" > "General".

Tap where it says "Add Tasks" and pick either "Top of List" or "Bottom of List".