How do I potty train my 20 months toddler? Whenever I place her on the potty, she'll start screaming and wailing & grabbing my neck tightly. :(

Seems like she is afraid of the potty. Maybe try changing the potty . For my Ger, I let her watch YouTube videos on potty training also. If she has an older sibling or cousin maybe let them sit on the potty to show her that it's not scary.