Custom Fields Question

Hi. I am having problems understanding how the ‘custom fields’ section works. I have watched all the tutorials many times over, and have read through the documents, many times as well. When following the youtube tutorial on Setting up New Fields in the ‘Custom Fields’ section, ie dragging a field from the left section to the right section, it does not remain in the right section.

Also, how do I remove the “Predefined Fields” eg, price, property furnishing, property status, etc. I do not require these.

I am also uncertain as to how to add taxonomies, other than through the ‘details’ page.

I seem to be the only one having this difficulty, so obviously the problem sits with my inabilities.

Some straight forward detailed instructions would be helpful.

Thanks
Chris